Disable Welcome Screen& Fast User Switching via Control Panel > User
Accounts.
Manually edit the registry and set AllowMultipleTSSessions=dword:0000001
Now, "Disconnect" the current user using Task Manager > Users
tab.
Type in the login name in the Classic Logon dialog and login as other user.
P.S: The Winkey+L cannot be used in this case to switch users. The only
option is thru Taskmgr. Winkey+L still brings up the Classic Logon dialog, but
terminates the current session, unlike the Task Manager method.
--
Ramesh Srinivasan MS-MVP, Windows XP Shell
http://www.mvps.org/sramesh2k