INT 62 u - FGDRIVER v3.03 - "FG_GETHPAGE" - GET CURRENT HIDDEN VIDEO PAGE NUM
        AX = 0037h
Return: AX = current hidden video page number (0000h-003Fh)
Note:   For FGDRIVER v1.10, this function was "FG_GETATTR" (see AX=0030h);
          "FG_GETHPAGE" was AX=0040h
SeeAlso: AX=0040h,AX=0043h,AX=0091h

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