VMS Help MACRO, /MIGRATION, Compiler Directives, .DEFINE PAL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Defines an arbitrary PALcode function such that it can be called
    later in the MACRO source.

    Format

      .DEFINE_PAL  name, pal_opcode, [,operand_descriptor_list]

  Additional Information (explode) :

• Parameters
• Description
• Example