Hi everyboby, i am new to here, nice to meet all of u (i came from Hong Kong, please don't mind my bad english) I followed the step in order to make my winxp which just upgraded to sp2 rtm build to have the concurrent sessions, i found that the step is not quite clear enough, here is what i have done (please notice that i am not clean installation from a unattened cd): 1. Extract the attached termsrv.dl_ (which posted by the administrator at the start of this thread) and overwrite to c:\windows\system32 (for my case, even i booted to safe mode, when overwrite this file, it said it is using by the system, so i boot by win98 boot disk to dos and overwrite it) 2. Click: Start - Run And type: regedit Go to: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Terminal Server\Licensing Core Right-mouse-click on the right pane and create a new DWORD: EnableConcurrentSessions Double-click the value and type: 1 3. Go to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon Double-click DWORD: AllowMultipleTSSessions and change the value to 1 that's all here, thank you everybody for this hack termsrv.dl_