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[Remko]

Use TS.Sessions[i].Logoff

Maybe you should read the documentation...

procedure Logoff(bWait: Boolean);
The Logoff function logs off a specified Terminal Services session


Parameters
bWait
Indicates whether the operation is synchronous. Specify TRUE to wait for the operation to complete, or FALSE to return immediately.
Exceptions raised
EJwsclWinCallFailedException
will be raised if the call fails.