/sys$common/syshlp/helplib.hlb System Services, $EXIT, Argument  *Conan The Librarian (sorry for the slow response - running on an old VAX)

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    OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       read only
    mechanism:    by value
    Longword value to be saved in the process header as the
    completion status of the current image. If you do not specify
    this argument in a macro call, a value of 1 is passed as the
    completion code for VAX MACRO and VAX BLISS-32, and a value of
    0 is passed for other languages. You can test this value at the
    command level to provide conditional command execution.