## Virtual Device Driver Reference for OS/2

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### DOS Session Destruction

When a user exits a DOS session, the virtual device drivers are notified to clean up any resources owned by that DOS session (that is, the virtual device driver's DOS session termination entry points are called by the DOS Session Manager). Memory is released and the process is terminated, as is done with a normal OS/2 process. DOS sessions can also be terminated by a virtual device driver if unsupported behavior is detected, or by the DOS emulation component (if it is damaged or is otherwise unable to function).