Difference between Logoff and Disconnect
Log off terminates TS session and all resources are returned to the Server.
Disconnect closes your TS, but leaves your session (with its applications and data) running on the TS.
If you reconnect to the Server before the disconnection timer (defined in Connection Configuration or User Manager) goes off, you’ll return to the same TS desktop you had before disconnecting.
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Thanks for the informative explanation!