Windows XP does not allow concurrent sessions for its Remote Desktop feature.
What this means is that if a user is logged on at the local console, a remote user has to kick him off (and ironically, this can be done even without his permission) before starting work on the box. This is irritating and removes much of the productivity that Remote Desktop brings to Windows. Read on to learn how to remove that limitation in Windows XP SP2
A much touted feature in SP2 (Service Pack 2) since then removed was the ability to do just this, have a user logged on locally while another connects to the terminal remotely. Microsoft however removed the feature in the final build. The reason probably is that the EULA (End User License Agreement) allows only a single user to use a computer at a time. This is (IMHO) a silly reason to curtail Remote Desktop's functionality, so we'll have a workaround.
Microsoft did try out the feature in earlier builds of Service Pack 2 and it is this that we're going to exploit here. We're going to replace termserv.dll (The Terminal Server) with one from an earlier build (2055).
To get Concurrent Sessions in Remote Desktop working, follow the steps below exact
1. Download the termserv.zip file below and extract it somewhere.
2. Reboot into Safe Mode. This is necessary to remove Windows File Protection.
3. Copy the termserv.dll in the zip to %windir%\System32 and %windir%\ServicePackFiles\i386. Ifthe second folder doesn't exist, don't copy it there. Delete termserv.dll from the dllcache folder:
%windir%\system32\dllcache
4. Merge the contents of Concurrent Sessions SP2.reg file into the registry.
5. Make sure Fast User Switching is turned on. Go Control Panel -> User Accounts -> Change the way users log on or off and turn on Fast User Switching.
6. Open up the Group Policy Editor: Start Menu > Run > 'gpedit.msc'. Navigate to Computer Configuration > Administrative Templates > Windows Components > Terminal Services. Enable 'Limit Number of Connections' and set the number of connections to 3 (or more). This enables you to have more than one person remotely logged on.
7. Now reboot back into normal Windows and try out whether Concurrent Sessions in Remote Desktop works. It should!
If anything goes wrong, the termserv_sp2.dll is the original file you replaced. Just rename it to termserv.dll, reboot into safe mode and copy it back.
termserv.dl_ file is provided in the zip is for you slipstreamers out there. Just replace that file with the
corresponding file in the Windows installation disks.
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