The print symbiont modification (PSM) routines allow you to
    modify the behavior of the print symbiont supplied with the
    operating system.

  Additional Information (explode) :

• PSM$PRINT
• PSM$READ_ITEM_DX
• PSM$REPLACE
• PSM$REPORT
• USER-FORMAT-ROUTINE
• USER-INPUT-ROUTINE
• USER-OUTPUT-ROUTINE