Device Lock
Contents
1. Enable access control for USB scanners if checked allows Device Lock Service to control access to scanners plugged into the USB port Otherwise even if the USB port is locked scanners continue to function as usual NOTE Some USB digital cameras with the DPOF Digital Print Order Format support are recognized by Windows as scanners Enable access control for USB Bluetooth adapters if checked allows Device Lock Service to control access to Bluetooth adapters plugged into the USB port Otherwise even if the USB port is locked Bluetooth adapters continue to function as usual Enable access control for USB and FireWire network cards if checked allows Device Lock Service to control access to network cards plugged into the USB or FireWire IEEE 1394 port Otherwise even if the USB or FireWire port is locked network cards continue to function as usual These security parameters enable you to completely lock USB and FireWire ports but allow the usage of some devices For example you can disallow using all the USB devices except the mouse and keyboard Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 15 2 5 Batch Permissions Batch Permissions is a powerful and useful function Midsize and large networks contain many similar computers with similar devices e g all computers have floppy drives and CD ROMs and Batch Permissions allow network administrators to set2. you can specify an additional account user name local or global group to have access to a device e g AccessToFloppy for floppy drives AccessToFloppy D1 John Setup assigns the Full Access right including the Allow Format and Allow Eject privileges for the account specified in this parameter NOTE The account must exist before it can be assigned to a device type If CtrlUSBHID CtrliUSBPrint CtriUSBScan and CtriUSBBth parameters are enabled Device Lock controls access to Human Input Devices mouse keyboard printers scanners and Bluetooth adapters plugged into the USB port If the Ctr FWNet parameter is enabled Device Lock controls access to network cards plugged into the USB and or FireWire IEEE 1394 port Otherwise even if ports are locked these devices continue to function as usual This enables you to completely lock USB and FireWire ports but allow the usage of some devices e g USB mouse If you have purchased a license for Device Lock you can also specify the location of its license key file in the Device Lock ini file so Setup automatically registers new versions of a service RegFileDir C Directory where C Directory is where your license key file is located You can also specify a destination directory for Device Lock Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 20 Instal Dir C Program Files Device Lock If you want to run a prog
3. Files Device Lock In any case you can select another directory for installation You have the following two choices either install both Device Lock Service and Device Lock Manager using Typical setup or install only Device Lock Service using Custom setup and select the Device Lock Service component If you install Device Lock on an NTFS partition Setup protects Device Lock s directory and files by allowing only members of the Administrators group or the SYSTEM account to access Device Lock s files or to uninstall Device Lock Access Control Settings for DeviceLock Ei EY Auditing Owner Type Name jl Pemission Th Allow SYSTEM Full Control Ta Allow Administrators ACERLAPT OP Administrators Full Control Setup protects Device Lock Service by allowing only members of the Administrators group or the SYSTEM account to start stop or delete the service Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 18 During the installation Setup Lock Devices suggests that you set permissions to the local devices Check the Create local groups if not existing checkbox and Setup will create the special local user group Allow Access To for each device type e g Allow_Access_To_Floppy for floppy drives if these do not exist on the local computer Select the devices you would like to automatically lock during installation and press the Lock button Setup assigns th
4. devices that support write ES Flush Buffers operations e g floppies ZIPs JAZZs etc Flush Buffers cannot be used for devices such as CD ROMs NOTE If you select a device with a removable media make sure that this device has the media inserted and isn t marked as read only Flush Buffers is very useful for removable medias i e floppies ZIPs Magneto Optical disks etc It can prevent your data from being lost because of a write behind cache Windows gives you the option to use write behind caching to improve the performance of removable disk drives but sometimes it may be a reason for data loss on those drives It is recommended to force the flushing of a disk s cache from time to time especially before ejecting disks Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 17 Device Lock Service 3 1 Installation Device Lock Service can be installed on any computer running Windows NT 2000 XP or Windows Server 2003 To install Device Lock Service run Setup setup exe Device Lock Service installs to the directory of your choice Setup tries to find a Device Lock Service c Program Files DeviceLock installation and if one exists Setup suggests that you install Device Lock Service to the same directory If a previous installation does not exist Setup suggests that Device Lock Service be installed to the Program Files directory on the system drive e g C Program
5. permissions for all of them quickly and uniformly Batch Permissions is available once Device Lock Manager is loaded You do not need to connect to any computer directly to use this function NOTE Any permission you set using Batch Permissions overwrites all previously assigned permissions on those devices individually To access Batch Permissions select Batch Permissions from the File menu press Shift F2 os Ja RE U BRE or press the appropriate button at the top right side of the main dialog Select Computers You must select the computers that you want to include in the batch processing To add computers to the list press the Add button This opens a dialog with the computer tree where you can select any computer available on your network Double click the computer name in the computer tree to add this computer or type the computer s name manually and press the OK button to include selected computers to the list Also you can load computers from an external file Press the Load button and select a file that contains the list of computers Two file formats are supported text file txt and comma separated values csv A text file must contain each computer s name on separate lines Computer names in a csv file must be separated by commas or semicolons To save a computer listing to an external file press the Save button then select the type of the file txt or csv If you want Device Lock Service
6. system directory e g c winnt system32 If the service is on the client system but is outdated Device Lock Manager replaces it DeviceLock Device Lock Manager automatically starts Device Lock Service if it s stopped on the system If you successfully connect to a computer its name appears in the status bar of Device Lock Manager Device Lock Manager functions become available only if you are connected to a computer Floppy Hard dek The list of device types Floppy Removable Pa Parallel port Serial port etc appears at the top right side of Removable the main dialog Serial port Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 11 If Display Available Devices Only is enabled in the Options menu Device Lock Manager shows only those devices currently available from your computer Otherwise you will see every type of device that Device Lock supports This is useful when you want to set permissions to devices that are not yet installed or are currently unplugged from the computer NOTE Device Lock Service automatically detects new devices and sets permissions if any for them Device Lock Service recognizes new wi Display Available Devices Only devices not by their user mode names or letters such as A COM1 but by their internal names such as Device Floppy0O Device Serial0 so it works even with unnamed devices To set permis
7. All rights reserved Ecora Software Device Lock User Manual 4 1 2 Security Reliable access control functionality is the primary focus of Device Lock Device Lock uses Remote Procedure Call RPC technology for communication between the service and the manager It uses the Windows user level security subsystem for authentication Device Lock s security is integrated into the Windows access control subsystem Remote computers with an installed Device Lock Service can only be accessed by someone with administrator privileges Because Device Lock uses standard protocols it operates like any other Windows administrative tool such as User Manager Server Manager Event Viewer etc The Device Lock Service on each client machine checks all input data for size and type eliminating buffer overflow attacks DeviceLock Manager Security Support Provider Interface 5 3PI Bos HT Domain ee Service or Active Directory Client SE Security Descriptor gt D A_L i User SID Group SIDS Security Descriptor gt Dal l Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 5 1 3 Requirements Device Lock works on any computer using Windows NT 2000 XP or Windows Server 2003 To install and use Device Lock you MUST have administrative privileges If you are going to use Device Lock only on a local computer you must have local a
8. Lock User Manual 10 All frequently used computers are added automatically to MMK OIN the most recently used MRU list so they can be easily PIIIWHISTLER accessed WER SL_SERVWER If you don t have administrative privileges on a selected computer Device Lock Manager displays the Enter Network Password dialog and you ll be able to connect under the account of any other user The Enter Network Password dialog appears when you attempt to connect to a computer but the domain controller DC does not recognize the user account you have used to log on This often occurs when you are logged on as the administrator of a local computer and attempt to access domain resources To access the Enter Network Password domain resources you must provide a valid user account and password that the domain recognizes User accounts are domain name followed by a backslash and the user name e g D1 John Device Lock Service should be installed on the computer so you can control the access to devices on that computer Device Lock supports remote installing This lets a Systems Administrator set up a service on distant machines without having to physically go to them If the Device Lock Service isn t installed on the remote system to which you are connecting Device Lock Manager suggests that you install the service Select the Device Lock Service executable file d service exe and Device Lock Manager copies it to the remote Computers Windows
9. User Manual Device Lock Ecora Software Inc Contents Using this Man Al WEEN 3 1 o TEE 4 1 1 General Information EE 4 L2 SECU EE 5 ed EE EE 6 1 2 dE Edert 7 2 DEVICE LOCK MAaANaGe F sdisnsisetacereieiiinesusueeinvindvunsuribieeensstuaenaees 8 SZ DN ge Ce E dee WEE 8 ge L L Eege 9 SSC Malk DIGIOG WEE 10 2 4 Permissions Dialog EE 13 229 ug ele Een Ee EE 16 2 6 CPUS ung 17 3x DeVice LOCK 5 5V CO ee NENNEN A MAN kU SARA R 18 Sch Wb ic ge E 18 ADDODC EH 22 PeriMmiSSiONs E Xalt D I EE 22 Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 2 Using this Manual This manual assumes you re familiar with basic functions like click right click and double click and that you re familiar with the basics of the operating system you re using This manual also assumes that you have basic network knowledge as well as the ability to install a Local Area Network LAN We strongly recommend reading this manual very carefully and thoroughly This manual uses the following conventions Italics for file names and paths Bold for buttons menus menu items and other named user interface items Bold Italics for notes and comments Keyboard keys with a plus sign separating keys that you press simultaneously For example press CTRL ALT DEL to restart your computer Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Softwar
10. ant to deny all actions for a selected user or user group you must select No Access Also to deny all actions you can set the denied time for all periods To deny access to devices for all users and user groups add only the Everyone user to an account s list and select No access or set the denied time for all periods Also you can remove all records from an account s list and set empty permissions so nobody can access devices Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 14 For USB and FireWire ports you can define additional security parameters Press the Security Settings button to define security parameters such as Enable access control for Security Settings USB HID if checked allows Device Lock Service to control Enable access control For USB HID mouse keyboard etc access to Human Input Devices WlEnable access control For USB printers mouse keyboard etc plugged Enable access control for USB scanners into the USB port Otherwise Enable access control For USB Bluetooth adapters WlEnable access control For USB and FireWire network cards even if the USB port is locked Human Input Devices continue to function as usual Enable access control for USB printers if checked allows Device Lock Service to control access to printers plugged into the USB port Otherwise even if the USB port is locked printers continue to function as uSual
11. dministrative privileges If you are going to use Device Lock throughout your network you must have domain administrator privileges If you want to use Device Lock on your network you must have a functioning TCP IP network protocol However Device Lock can also work on stand alone computers A network is needed only if you want to control Device Lock Service from a remote computer Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 6 1 4 Main Purpose Device Lock gives network administrators control over which users can access what devices floppies Magneto Optical disks CD ROMs DVDs ZIPs USB FireWire infrared serial and parallel ports tape devices WiFi and Bluetooth adapters etc on a local computer Once Device Lock is installed administrators can control access to floppies CD ROMs or other devices including access control by the time of day and day of the week Device Lock enhances access control for Windows system administrators and helps control removable disk usage Device Lock can protect network and local computers against viruses Trojan horses and other malicious programs often introduced by removable media Device Lock can protect disks from accidental or intentional formatting Device Lock allows administrators control over which users can eject what removable devices Network administrators can also use Device Lock to flus
12. dministrators a device type are shown in the list of accounts at the Ef Everyone left hand side of the permissions dialog RESTRICTED T SYSTEM To add a new user or user group to the list of accounts click on the Add button You can add several accounts simultaneously ata dmiristrators Administrators have complete opd unrest ae4llow Access to CDRom Members can access CD AUMs ji allow Access Io Floppy Members can access floppy dives allow Access to Parallel Members can access parallel ports allow Access to Aambisk Members can access RAM disks aeSllow Access to Removable Members can access removable drives allow Access to Seral Members can access seral ports allow Access Io Tape Members can access tape devices To delete a record from the list of accounts use the Delete button Use the Set Default button to set default permissions for devices Default permissions are enabled by using the following access selections The Everyone account has Full Access rights except for the Allow Format privilege s Members of the Administrators group and the SYSTEM account have Full Access rights including the Allow Format and Allow Eject privileges Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 13 Using special time control you can define a time when a selected user or user group will or will not have access to devices Time control appears at the top right side o
13. e Device Lock User Manual 3 Overview 1 1 General Information Preventing the introduction of inappropriate software and data is important when trying to protect and administer a company s computer network The traditional solution has been a physical lock on the floppy drive Device Lock eliminates the need for physical locks and has a number of advantages Device Lock is easy to install Administrators can have instant access from remote computers when necessary There are no physical keys to store and manage The administrator of the machine or domain can designate user access to floppy drives CD ROM drives other removable media tape drives WiFi and Bluetooth adapters or USB FireWire infrared and serial and parallel ports Any types of the file systems are supported Device Lock consists of two parts Device Lock Service d service exe and Device Lock Manager d manager exe Device Lock Service is the core of Device Lock Device Lock Service is installed on each client system runs automatically and provides device protection on the client machine while remaining invisible to that computer s local users Device Lock Manager is the control interface systems administrators use to remotely manage each system that has Device Lock Service DevyiceLock Manager Sy DeviceLock Service Floppy Ee Optical Tape P5 CD ROM DYD COM port a LPT port Copyright 1997 2004 SmartLine Inc
14. e Full Access right including the Allow Format and Allow Eject privileges for members of the Administrators group and the SYSTEM account Members of the Allow_Access_To_ group will have the Full Access right including the Allow Eject privilege but without Allow Format CT Tish sts EH ET EI lt r r Check Enable access control for USB HID Enable access control for USB printers Enable access control for USB scanners or Enable access control for USB Bluetooth adapters to allow Device Lock Service to control security for Human Input Devices mouse keyboard etc printers scanners or Bluetooth adapters plugged into the USB port To allow access control for USB and FireWire network cards check Enable access control for USB and FireWire network cards Otherwise even if ports USB and or FireWire are locked these devices continue to function as usual NOTE Some USB digital cameras with the DPOF Digital Print Order Format support are recognized by Windows as scanners Press the Skip button if you prefer to wait until after installation to set permissions to these devices using Device Lock Manager Setup also supports unattended silent setups This provides an installation method that can be used from within a batch file To install Device Lock Service without user intervention run Setup with the s parameter e g c setup exe s There is a special configuration file for silent setups named Device Lock ini Device Lock i
15. enu If you want the computer tree to expand Se automatically select Expand Network Tree in the Options menu To refresh a list of computers press F5 or select Refresh Network Tree from the View menu Also you can refresh the state whether active or inactive of a selected computer by pressing Shift F5 or selecting Refresh Selected Computer from the View menu al Refresh Webwork Tree If your computer is not connected to a network the list of computers will be empty or may contain only a single record Microsoft Windows Network or similar message To access a remote computer it needs to have Device Lock Service installed and running and it needs to have a connection to your computer To access a remote computer select it from the computer tree Device Lock Manager automatically connects to the computer after it has been selected To select a system use the mouse to select the computer or use the keyboard s arrow keys and press ENTER Alternatively you can type in the computer name in the field above the computer E BUHG tree and press ENTER To connect to the local computer do not specify a computer name If Connect to Local Computer at Startup is enabled in the Options menu Device Lock Manager automatically connects to the local computer each time it starts up jw Connect to Local Computer at Startup Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device
16. eriods Alternatively you can remove all records from an account list and set empty permissions To prevent anyone from accessing the USB port but allow the USB mouse and keyboard Add the Everyone user to an account list and select the No Access right or select the Full Access right and set the denied time to all periods Open the Security Settings dialog press the Security Settings button on the Permissions dialog and clear the Enable access control for USB HID parameter For anyone to read floppy disks but only members of the Administrators group to write data to the media Add only the Everyone user and the Administrators local group to an account list select Full Access for Administrators and Read only for Everyone then set the allowed time for all periods for each record in the account list For only members of the Administrators group and the SYSTEM account to access a device at any time Add only the SYSTEM user and the Administrators local group to an account list select the Full Access right and set the allowed time for all periods for each record in the account list For anyone can access a device at any time but only members of the Administrators group to perform formatting and checking of the media of the device Add only the Everyone user and the Administrators local group to an account list select the Full Access right and set the allowed time for all periods for each record in the account list Uncheck the A
17. f the permissions dialog Use the left mouse button and select the allowed time To select a denied time use the right mouse button Also you can use the keyboard to set times arrow keys for navigation and the spacebar to toggle allowed denied time NOTE each user can have his her own allowed denied time To define which actions on devices are to be allowed for a user or user group set the appropriate rights and privileges s Full access to enable the reading writing deleting executing etc of files and directories Read only to enable only the reading of files and directories NOTE Read only means No access for tape devices WiFi Bluetooth USB FireWire infrared and serial and parallel ports Allow Format to enable the formatting checking and any other direct access of drives NOTE You can enable this privilege only if Full Access is selected This privilege is not available for CD ROMs DVDs tape devices WIFI Bluetooth USB FireWire infrared or serial and parallel ports Allow Eject to enable ejection of the media NOTE You can enable this privilege only if Full Access is selected This privilege controls only ejection via software Hardware ejection using the Eject button on a device s front panel cannot be prevented No access user cannot access a device NOTE When you set permissions to WiFi and Bluetooth adapters it not affects existing connections If you w
18. h a storage device s buffers Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 7 Device Lock Manager 2 1 Installation Device Lock Manager can be installed to any computer running Windows NT 2000 XP or Windows Server 2003 To install Device Lock Manager run Setup setup exe Device Lock Manager installs to the directory of your choice Setup tries to find a Device Lock Manager installation and if one exists Setup suggests you install Device Lock Manager to the same directory If a previous installation does not exist Setup suggests you install Device Lock Manager to the Program Files directory on the system drive e g C Program Files Device Lock You can select another directory for installation cc Program Files DeviceLock You have two choices install both Device Lock Manager and Device Lock Service using Typical setup or you can install only Device Lock Manager using Custom setup then selecting the Device Lock Manager component After a successful install you can run Device Lock Manager by selecting the Device Lock Manager item from the Programs menu Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 8 2 2 Interface Device Lock Manager has a user friendly easy to use interface All functions can be accessed with either a mouse or keyboard In any dialog you can press the F1 bu
19. llow Format privilege for the Everyone user and check this privilege for the Administrators group Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 22 f For members of the Users group to access a device only from Monday till Friday and between 12pm and 5pm but Administrator to access this device at any time Add only the Users local group and the Administrator user to an account list and select the Full Access right for each Set the allowed time for all periods for the Administrator user Set the time as shown on the picture below for the Users group NOTE The Administrator user must not belong to the Users group Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 23
20. ni must be in the same directory where setup exe is located With this file you can customize the installation parameters For example to install only Device Lock Service Device Lock ini should look like Install Service 1 Manager 0 Documents 0 To automatically lock devices during installation specify the Lock Devices parameters Only members of the special local user group Allow_Access_to_ the operating system SYSTEM and the local administrators have access to devices Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 19 Lock Devices Floppy 1 Removable 1 CDROM 1 Serial 1 Parallel 1 Tape 1 USB 1 IRDA 1 FireWire 1 Bluetooth 1 WiFi 1 Setup assigns the Full Access right including the Allow Format and Allow Eject privileges for the operating system SYSTEM and the local administrators If the CreateGroups parameter is enabled Setup creates the special local user group Allow_Access_To_ for each device type e g Allow_Access_To_Floppy for floppy drives if these do not exist on the local computer Members of the Allow_Access_To_ group have the Full Access right including the Allow Eject privilege but without Allow Format If the CreateGroups parameter is disabled and the special group does not exist on the local computer only the operating system and the local administrators have access to the device In the AccessTo parameter
21. ram e g batch file after a successful install you can specify the Run parameter Misc Run C mybatchfile bat Device Lock supports remote installation to help system administrators set up a service on remote machines without ever having to physically go to them If the Device Lock Service isn t installed on a remote Device Lock Manager will Suggest that you install the service Select the Device Lock Service executable file d service exe and Device Lock Manager will copy it to the remote computer The Device Lock Service executable file will be copied to the Windows system directory e g c winnt system32 if this service doesn t exist on this system If the service exists on this system but is too old Device Lock Manager will copy the executable file to the directory of the old file and the old file will be replaced Device Lock can also be installed using Microsoft Systems Management Server SMS Use the package definition files DevLock pdf for SMS version 1 x and DevLock sms for SMS version 2 0 and later supplied with Device Lock located in the sms zip file Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 21 Appendix Permission Examples a b U C d e To prevent anyone from accessing a device at any time Add the Everyone user to an account list and select the No Access right or select the Full Access right and set the denied time to all p
22. sions for a device type highlight it use CTRL and or SHIFT to select several types simultaneously and select Set Permissions from the File menu or press F2 Alternatively you can press the appropriate button at the top right side of the main dialog box Below the list of types Device Lock Manager displays the devices that are available for a selected device type In this list you can see the devices that are currently available for local users on the remote computer If there are no devices currently available for the yi selected type this list is empty To ac Hard dek Device Harddisk olumet see a listing of all the devices that TE gg ED Hard disk DeviceHarddisk olume are available to the remote dF CD ROM Device CdRomo computer select all records in the list of types NOTE When you set permissions for a device type you set these permissions for every device belonging to that type It is impossible to set different permissions for two different devices if they are of the same type e g both are floppy drives Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 12 2 4 Permissions Dialog This dialog controls access to devices Set permissions to a device type or toa group of types and define the users and times day of the month and or day of the week each can be accessed The names of the users and user groups assigned to PS ACERL APTOP A
23. to be automatically installing on the computers selected for the batch processing check Install Update Service at the left bottom side of the dialog If the service is on the computer but is outdated Device Lock Manager updates it Add users or user groups to the account s list Define allowed denied times on the time control and set the appropriate rights and privileges for each user and user group as described in Section 2 4 Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 16 The final step is selecting the devices w erte port you want to process There are few Parallel port types of devices available in the Device Lock Manager Floppy Removable CD ROM and so on Each of these types represents all the devices of this category i e Floppy represents all floppy drives that are available on the computer Removable all removable drives and so on To start batch processing press the Set Permissions button Batch Processing The RPC server ts unavailable 2 6 Flush Buffers Device Lock can save a disk s cache and unsaved buffers to selected device To flush the buffers highlight the device in the devices list use CTRL or and SHIFT to select several devices Simultaneously and then select Flush Buffers from the File menu press F6 or press the appropriate button at the bottom right side of the main dialog Flush Buffers is available only for
24. tton to get specific help The main window of Device Lock Manager can be resized Device Lock Manager Saves its size and position and restores these at its next startup g DeviceLock Device Lock Manager has a menu at the top of its main window through which most functions are accessible You can select Always on Top from the View menu to keep the Device Lock Manager on top any other applications always displayed on the screen Copyright 1997 2004 SmartLine Inc All rights reserved Ecora Software Device Lock User Manual 9 2 3 Main Dialog When you start Device Lock Manager it displays the main dialog where you can select a computer to control The left side of the main dialog shows a list of the computers available in your network This list is called the computer tree Each computer running Device Lock Service has an icon Each computer without Device Lock Service running has an icon of a computer overlaid by a El Microsoft Windows 3 en IS SL_SERVER red circle containing a white X indicating the computer ER TEST is inactive for Device Lock If Check Computers in the HB MMX Options menu is not selected Device Lock Manager does not check Device Lock Service on each computer and all computers have the same icon If you want a listing of only active computers computers with running and accessible Device Lock Service select Check Computers and Hide Inactive Computers in the Options m
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