The MACRO-64 assembler provides a library of macros that help you
    to program in conformance with the OpenVMS Calling Standard. This
    library also allows you to define your own opcodes and packed
    decimal data. The library, called MACRO64.MLB, is installed on
    your system with the MACRO-64 assembler.

    The MACRO-64 assembler automatically adds the MACRO64.MLB library
    to the library list before it begins processing your source
    program. Consequently, you do not need to add it manually using
    the .LIBRARY directive.

    The following macros are supplied by the MACRO-64 Assembler:

       $BEGIN_EPILOGUE
       $CALL
       $CODE_SECTION
       $DATA_SECTION
       $END_EPILOGUE
       $END_PROLOGUE
       $END_ROUTINE
       $LINKAGE_PAIR
       $LINKAGE_SECTION
       $OPDEF
       .PACKED
       $PROCEDURE_DESCRIPTOR
       $RESET_LP_LIST
       $RETURN
       $ROUTINE