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

  The IN_RANGE function determines  whether  a  value  is  in  the
  defined subrange.

  Syntax:

     IN_RANGE(expression,lower-expression,upper-expression)

  This function returns TRUE if the contents of the variable is in
  the range specified by the lower-expression and upper-expression
  values.