How to enable RDP for Windows Server 2008 Server Core
Even though the Server Core option of Windows Server 2008 does not have shell, you can still RDP (Terminal Services) into it by using RDC from a Windows Client. To do that, you have to first enable the RDP on Server Core by using the following cscript command.
Cscript windowssystem32scregedit.wsf /ar 0
In order to use TS from a pre-vista OS you have to turn off the on by default high security by using the following command
Cscript windowssystem32scregedit.wsf /cs 0
While terminal serviced into the Server Core, you can logoff.exe command line to terminate your session.