Connect to console session via Terminal Services

From the command prompt, enter mstsc -v:servername /F -console to connect as console to a remote server.

• -v: - indicates the remote server
• /F - use full screen mode
• -console - connect as console

If someone is currently logged into the console, you will see the following message:

The user domain\username is logged locally on to this computer. The user has been idled for number minutes. The desktop is unlocked. If you continue, this user's session will end and any unsaved data will be lost. Do you want to continue?

If you continue, the current console user is logged off and remote server will be locked until you end your remote session.

Reference: http://support.microsoft.com/kb/278845