/sys$common/syshlp/helplib.hlb MACRO, VAX MACRO Assembler, Directives, .ENTRY  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Defines a symbolic name for an entry point and stores a register
    save mask (two bytes) at that location.

      .ENTRY symbol,expression

    symbol

    The symbolic name for the entry point.

    expression

    The register save mask for the entry point.  The expression  must
    be an absolute expression and must not contain any undefined
    symbols.

    The symbol is defined as a global symbol with a value  equal  to
    the value  of  the location counter at the .ENTRY directive.  You
    can use the entry point as the transfer address of the program.