How to enforce autologin not just first time when computer boots, but even if user click logoff.
So everytime when user clicks logoff, he is immediately loged back.
I assume you already configured the "AutoAdminLogon" key along with the "DefaultPassword" and "DefaultUserName" keys in the appropriate "WinLogon" branch in your Windows Registry...
To force automatic login after a simple Logout (Logoff) operation, add a "ForceAutoLogon" (without quotation marks) string entry with the value of "1" (without quotation marks).
We used to do this on workstations connected to Novell NetWare networks for the few "special" users who couldn't resist causing a lot of computer problems. Here's Novell's KnowledgeBase document on all the AutoAdminLogon settings:
TID 10052847 - Configure AutoAdminLogon for Novell Clients for Windows NT/2000/XP