These macros reside in the directory SYS$LIBRARY:STARLET.MLB and
    can be used by both application code and system code.

    The page macros accommodate for 64-bit addresses. The support is
    provided by the QUAD=NO/YES parameter.

    You can use certain arguments to these macros to indicate
    register sets. To express a register set, list the registers,
    separated by commas, within angle brackets. For example:

    <R1,R2,R3>

    If the set contains only one register, the angle brackets are not
    required.

  Additional Information (explode) :

• $SETUP CALL64
• $PUSH ARG64
• $CALL64
• $IS 32BITS
• $IS DESC64