Windows Server 2012: Allow multiple logins for the same user
Have you ever wanted to log into a local user on your Windows Server 2008 or Windows Server 2012 installation from 2 different places at the same time without logging off the first user? This can be easily achieved with a simple registry hack. You’ll want to open “regedit” and make your way down to:
HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server
Look for the registry entry for fSingleSessionPerUser and simply modify this to “0”. By default, this should be a “1”.