Sometimes, as a sysadmin, you need to access a workstation to do some maintenance, and you don’t want the user to be asking you why he has to type is username again the next day.
Well, here’s a sollution.
Before shutting down the workstation just open the registry editor and navigate to:
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionAuthenticationLogonUILastLoggedOnUser
Edit the LastLoggedOnUser key and type the username you want to see on the next reboot.