Scenario: By default Windows 2008 R2 only allows one session per user. It is often the case that more than one Administrator needs to login.
To enable this go-to START -> ADMINISTRATIVE TOOLS -> REMOTE DESKTOP SERVICES -> REMOTE DESKTOP SESSION CONFIGURATION MANAGER
When that page opens up right-click “Restrict each user to a single session” and select Properties.
When the new window opens ensure “Restrict each user to a single session” is un-ticked.
You’ll get a warning message as below:
Just logout and log back in for changes to take affect.