Because the backend piobe, used to process print jobs on local queues, is the most commonly used and possibly the most complex backend shipped with the base operating system, it is used as the primary example in this section. Using piobe in this fashion will allow a better development of the base operating system spooler concepts.
The purpose of this section is to demonstrate that the spooler is a real process with a beginning, discrete points in between (no black boxes), and an end. The spooler is a series of components whose interaction is completely dependent upon how a specific queue is configured. Recognizing this can have the following results: