NAME
	IsRexxMsg - Function to determine if a message came from ARexx

    SYNOPSIS
	result = IsRexxMsg(msgptr)
	D0                 A0

	BOOL IsRexxMsg(struct RexxMsg *);

    FUNCTION
	This function can be used to determine if a message came from an
	ARexx program.

    INPUTS
	msgptr - A pointer to the suspected RexxMsg.

    RESULTS
	result - A boolean:  TRUE if it is an ARexx message, FALSE if not.

    SEE ALSO
	CreateRexxMsg()

    BUGS