One of the easiest ways is to use the INPORT and OUTPORT VIs. Find what port your parallel port is in and then send data to/receive data from that port. For more information on the port itself, try: http://www.lvr.com/parport.htm#Basics. If you are using NT (I heard some of the other new OS's have the same problem) then you need to download accessHW.zip from the NI site.
Rob
