High Quality Content by WIKIPEDIA articles! A Deferred Procedure Call (DPC) is a Windows operating system mechanism which allows high-priority tasks (e.g. an interrupt handler) to defer required but lower-priority tasks for later execution. This permits device drivers and other low-level event consumers to perform the high-priority part of their processing quickly, and schedule non-critical additional processing for execution at a lower priority. DPCs are implemented by DPC objects which are created and initialized by the kernel when a device driver or some other kernel mode program issues requests for DPC. The DPC request is then added to the end of a DPC queue. Each processor has a separate DPC queue. DPCs have three priority levels: low, medium and high. By default, all DPCs are set to medium priority. When the processor drops to an IRQL (interrupt request level) of Dispatch/DPC level, it checks the DPC queue for any pending DPCs and executes them until the queue is empty or some other interrupt with a higher IRQL occurs.

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