INT 61 - Banyan VINES - POST MESSAGE ON LOCAL DISPLAY
        AX = 0008h
        BX = 0002h
        CX = flags
            bit 0: message will remain on screen until user presses ^X
            bit 1: ring bell after displaying message
            bit 2: blink
        DS:DX -> ASCIZ string to display (only first 80 chars used)
Return: AX = status
            0000h successful
            000Bh message display function currently busy
            000Ch message queue full
Note:   queues up to three messages to be displayed on the bottom line
SeeAlso: AX=0008h/BX=0003h

.