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Window XP is limited to one user login at a time. If you’ve a very powerful PC and you want to remote access your window at the same time of someone using it locally. Like if you’re at work and you want to connect to your home PC, without blocking other person who is using at the same time locally. Here is the solution for you.

http://www.kood.org/terminal-server-patch/

To overcome window XP limitation, you can simply install Terminal Server Patch to turn your system accessible. After this modification, to 3 concurrent users can access the same window XP a local user and 2 remote users.

While I was trying to access my desktop through my laptop on the same network i found following error:

“You cannot initiate a Remote Desktop Connection because the Windows logon software on the remote computer has been replaced by incompatible software MrvGINA.dll.

To correct this problem, please have the administrator of the remote computer contact the program vendor for a version that is compatible with Windows.”

This MrvGINA.dll get updated due to NetGear software installation. I found solution for this issue on the following link.
http://www.dougknox.com/xp/scripts_desc/fix_xp_logon.htm
Try it!