VMS Help PASCAL, Predeclared Routines, Misc, SEED  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The SEED function has a single integer parameter that  sets  the
  random  number  generator  seed  for  the  RANDOM function.  The
  function returns an integer that represents  the  previous  seed
  value.

  SEED(expression)

  The parameter is of type integer.