INT 62 u - FGDRIVER v4.02 - "FG_GETHPAGE" - GET CURRENT HIDDEN VIDEO PAGE NUM
	AX = 0043h
Return: AX = current hidden video page number (0000h-003Fh)
Note:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
SeeAlso: AX=004Ch,AX=0050h,AX=00AEh