INT 21 - TopWare Network OS v5.10+ - CALL TopShow FUNCTION
        AX = FF8Dh
        CH = monochrome flag (01h monochrome, 00h not monochrome)
        CL = screen mode of station to be viewed (see below)
        BL = graphic page number for monochrome
Return: AL = status (00h successful, else failed)
SeeAlso: AX=FF8Eh,AX=FFCFh

Values for screen mode:
 00h    text mode
 01h    720x348
 02h    640x408
 03h    720x352
 04h    640x390
 05h    reserved

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