This is a simple thing, you are remoted to the customers computer via MSTSC and you have now finished doing your thing and wish to hand back control.
click start and type the following in the search.
TSCON 0 /DEST:console
the 0 is the current session ID this can be anything from 1 to 10 so if "TSCON 0 /DEST:console" fails to hand the session back try "TSCON 1 /DEST:console" and so on.
Good Luck
