Asks the session manager to discard all stored data about this session, and then disconnects the application from the session manager.
If your application calls this on graceful exit, you may wish to ensure that it does <emphasis role="bold">not</emphasis> call it when exiting in response to the quit signal.
<note><para> This may not remove the application from the saved session (if any) if the user later does not choose to save the session when logging out. </para></note>
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