Library /sys$common/syshlp/helplib.hlb

  VSI Pascal supplies predeclared procedures  and  functions  that
  perform  various  commonly  used operations.  You do not have to
  declare these routines in order to call them from your code.

Additional Information: explode extract

Allocation Arithmetic Char Strng Dyn Alloc Low Level Ordinal Null String Parameter Transfer Privileged Misc