The Dameware MRC Agent on the systems allow the users to end the session at any time. In the System Tray right click on the Dameware agent and they can select Disconnect. The Dameware MRC application will state that the Desktop user disconnected the session via the MRC Tray menu and the logged in Active Directory account that ended the session.
I have outlined some of the security steps that customers can utilize to limit users to connect to end systems.
Dameware: Configuring default settings for end user and remote agent system security