Library /sys$common/syshlp/helplib.hlb  —  MACRO  /ALPHA  Supplied Library Macros, $PROCEDURE DESCRIPTOR, Notes
    o  Because the $ROUTINE macro invokes the $PROCEDURE_DESCRIPTOR
       macro for you, you do not need to use the
       $PROCEDURE_DESCRIPTOR macro if you use $ROUTINE. You may wish
       to use $PROCEDURE_DESCRIPTOR when you are not using $ROUTINE.
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