My group is engaged in the development of embedded controller instrumentation and PC based instrumentation. We have developed DOS based programs for interrupt driven serial interface using IRQ3 in "C" language. We are facing some problem in upgrading the same to a Windows environment. The software is Real Time Operating System (RTOS). We know BC++ and VC++. Specifically we require information about parallel Windows functions for DOS utilities like SETVECT and GETVECT. Thanks.