NAME
    CheckRexxMsg - Check if a rexxmsg is from arexx

SYNOPSIS
    result = CheckRexxMsg(message)
    D0                    A0

    BOOL CheckRexxMsg(struct rexxmsg *);

FUNCTION
    This function checks to make sure that the message is from ARexx
    directly.  It is required when using the Rexx Variable Interface
    routines (RVI) that the message be from ARexx.

    While this function is new in the V37 amiga.lib, it is safe to
    call it in all versions of the operating system.  It is also
    PURE code, thus usable in resident/pure executables.

NOTE
    This is a stub in amiga.lib.  It is only available via amiga.lib.
    The stub has two labels.  One, _CheckRexxMsg, takes the arguments
    from the stack.  The other, CheckRexxMsg, takes the arguments in
    registers.

EXAMPLE
    if (CheckRexxMsg(rxmsg))
    {
            /* message is one from arexx */
    }

INPUTS
    message         A pointer to the rexxmsg in question

RESULTS
    result          A boolean - TRUE if message is from ARexx.

SEE ALSO
    getrexxvar(), setrexxvar()