To disconnect from a terminal session

1. Open Terminal Services Manager.
2. Right-click the session you want to disconnect, and then click Disconnect.

Notes
You can always disconnect from your own sessions, but you must have Full Control permission to disconnect a session belonging to another user.
To open Terminal Services Manager, click Start, click Control Panel, double-click Administrative Tools, and then double-click Terminal Services Manager.
When you disconnect a session, the session remains attached to the terminal server in the disconnected state and any applications that are running continue to run. The applications remain running when the session is reconnected, with no loss of data.
You can also use the tsdiscon command to disconnect a session.
You can reset a session that is in the disconnected state, deleting the session from the server. You must have Full Control permission to do this.