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INT 21 - LANtastic v3+ - POP UP LAST RECEIVED MESSAGE
        AX = 5F9Ch
        CX = time to leave on screen in clock ticks
        DH = 0-based screen line on which to place message
Return: CF clear if successful
        CF set on error
            AX = error code (0Bh)
Note:   the original screen contents are restored when the message is removed
SeeAlso: AX=5F9Ah