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

  The allocation  size  routines  provide  information  about  the
  amount  of  storage  allocated  for  variables and components of
  various types.  The parameters may be in the form of variable or
  type  identifiers.   Each  routine returns an integer value that
  represents the allocation size of the given parameter.

  Additional Information (explode) :

• BITNEXT
• BITSIZE
• BIT_OFFSET
• BYTE_OFFSET
• NEXT
• SIZE