sioniee, thanks for your help. I can see the Mark IV on my network, I can see it's IP address but my prc-100 will not connect to it. I do not see it in my WiFi list... The light on the wireless card lights, it tries to connect and then say network offline. I am really frustrated and feel blind. The copyright on all of this software is over a decade old. Do you know if there are any updates? The iPhone app could not connect either.