The set of routines described in this chapter comprises the PMDF Application Program Interface (API). This interface may be used to submit to or remove messages from PMDF's message queues. The act of submitting a message to a message queue is called enqueuing while removing a message from a queue is called dequeuing. User interfaces¹ enqueue messages in order to send mail; programs which interface to other networks and mail systems dequeue messages to remove them from the queues. Some programs may both dequeue and enqueue messages; for example, intermediate processing programs such as document converters.
Note:
The callable SEND interface may be used simultaneously with the PMDF API routines.