INT 10 - VHRBIOS.SYS - SWITCH BETWEEN DUAL MONITORS??? AH = F3h Return: ??? Program: VHRBIOS.SYS is a driver for the Micro Display Systems "TheGenius" black&white A4/portrait monitor SeeAlso: AH=F0h"VHRBIOS.SYS",AH=F4h"VHRBIOS.SYS",AH=F6h"VHRBIOS.SYS"