User`s guide

3-2
Guide to Printers and Printing
Spooler Introduction
This section provides an overview of the spooler mechanisms used by Version 3.2.5 and
AIX Version 4. 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 AIX
operating system, it is used as the primary example in this section. Using piobe in this
fashion will allow a better development of AIX spooler concepts. Appropriate notes indicate
significant differences between Version 3.2.5 and AIX Version 4.
This section should give the reader a solid impression of the spooler as a real process that
has a beginning, discrete points in between (no black boxes), and an ending. If you learn to
treat the spooler as a series of components that interact with one another in ways
completely dependent upon how a specific queue is configured, three useful events can
occur:
• Problem determination and resolution can become easier.
• Bending the spooler to your specific business needs can become easier.
• You might see opportunities for spooler modification that you hadn’t considered.