for Fedora 12
modify /etc/gdm/custom.conf
for Windows 2003 Server
Run -> Regedt32.exe
modify /etc/gdm/custom.conf
[daemon]
TimedLoginEnable=true
AutomaticLoginEnable=true
AutomaticLogin=your_account
TimedLogin=your_account
TimedLoginDelay=0
for Windows 2003 Server
Run -> Regedt32.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
DefaultUserName=your_account
DefaultPassword=your_password
AutoAdminLogon=1