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)