There is an article called "NI 5102 Toggle PFI lines (high to low)". It describes doing this with LabView. I need to do it with NI-Scope/Ni-DAQ, via VB. Where can I find info on this?
Toggleing the PFI lines is not currently supported in NI-Scope, or Traditional NI-DAQ function calls. The only method currently available is to use either LabVIEW (as you noted) or use Component Works which is part of Measurement Studio. See KB 2CFDLG7C for more information.