• Windows XP Professional computer, remote desktop connect to the console session.
• Remote desktop to a Windows Server 2003 computer, the default is to start a new session.

Connect to the console session of a Windows Server 2003 computer :

command-line: mstsc /console

Windows Vista remote desktop client:

mstsc /admin

Reference: http://weblogs.asp.net/jeffwids/archive/2005/12/14/remote-desktop-to-console-session-on-windows-server-2003.aspx