If you do this then you will get Press Ctrl+Alt+delete to begin at the welcome-screen !
want to do this ? if yrs follow the below process
To enable the Ctrl-Alt-delete boxes you have to open regedit and goto :
1. HKEY_LOCAL_MACHINE
2.Software
3.Microsoft
4.Windows NT
5.Current Version
6.Winlogon
7. Create a new Dword Value There and name it as "DisableCAD" (without quote)
8. value must be set to "0"
that's it ! now log-off your computer and see it
note: You need to disable the welcome screen to do this
;)