## Presentation Device Driver Reference for OS/2

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### Spooler Components

The spooler interface (Spl...) is implemented in two libraries, PMSPL.DLL and PMPRINT.QPR, which support four activities:

Management of spool buffers for PM_Q_STD data (SplStdxxx interface)
Management of queued files (SplQmxxx interface)
Processing of queued files (SplQpxxx interface)
Displaying messages on the screen (SplMessageBox)