## MMPM/2 Device Driver Reference

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### DDCMD_DEREG_STREAM - Remarks

This message removes the communication link between the physical device driver and the stream handler for a particular stream instance. The only input is the stream handle, which indicates to the device driver which stream to destroy.

After a deregister, the VSD (or device driver) no longer has access to any buffers, and the buffers will be returned to SSM by the stream handler. The VSD does not have to return the buffers; they are returned for the it. The VSD should not return from the destroy until it has stopped using all buffers.