Remote desktop disconnected session problem

When I intentionally disconnect a session on Windows 7 Enterprise, after about 5 minutes the disconnected session automatically logs out. This happens either by using the start->disconnect option or clicking the "x" on the toolbar at top. I would rather the session remain disconnected and any programs running continue to run (as the definition of disconnect says). I have checked GPEDIT.MSC and there are no timeouts. Any ideas?

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