## Physical Device Driver Reference

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### Expected Responses

The physical device driver uses flags with the flag WORD of a data record to indicate the type of data that is part of this data record, and the action the device driver expects its monitor to take when it receives this data record. The monitor can also be expected to indicate a response to the action requested by the physical device driver by changing the flags before returning the data record to the data stream. In this way, flags in a monitor data record are used in a dialog between the physical device driver and its monitors. Failure on the part of a monitor to respond as expected to a request from the physical device driver can result in a deadlock.