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Andrea Beggi » Concurrent sessions in Windows XP: "Question:
How can I enable two concurrent sessions in Windows XP Service Pack 2 (SP2) or later?

Response:
The beta 2055 release of XP PRO SP2 let you run two sessions (one local console and one remote desktop) concurrently. This functionality was removed in the Final release. You can obtain copies of the termsrv.dll from version 2055 that lets you renable concurrent sessions. You must use a different user for each session. To enable concurrent sessions, perform the following steps:
1. Start a registry editor (e.g., regedit.exe).
2. Navigate to the
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\Licensing Core registry subkey.
3. From the Edit menu, select New, DWORD Value.
4. Enter the name “EnableConcurrentSessions,” then press Enter.
5. Double-click the new value, then set it to 1.
Here are some more detailed instructions and a link to get the termsrv.dll file from 2055.
Install the recovery console onto the hard drive (to use in the process, plus its good to have anyway in case of emergency http://support.microsoft.com/default.aspx?scid=kb;EN-US;307654
Copy this DLL file
http://members.lycos.nl/nessyh/files/term/termsrv.dll
into your system32 directory as TERMSRV.2055 make the appropriate registry changes listed above
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Terminal "