I'm using LabVIEW V8 professional on this computer, and I used an event structure like you said(which would have worked beautifully), but for some reason, I'm getting a new error concerning "DAQ-mx Create" in my read and write functions. This didn't happen when I was used version 7.1. Sighs, I know I'm a never ending source of inquiry, but I just seem to be struggling from error to error without enough progress. It's basically going to be a miracle at this point if I can get this demo to work the way it needs to by tuesday...