Should connecting usb wireless dongles to a usb extension cable which is plugged in to the desired usb port on my Mac Pro be problematic and, if so , how? On a naive theoretical level, it seems it should be OK. There will be a voltage drop to the dongle which probably isn't a problem for the dongle itself, but may be a problem for its output signal) and also the possibility of interference. I intend to try it but want to understand any possible problems. I shouldn't need more than a few feet of extension to get around some potentially shielding obstacles in my close quarters home office where positions are pretty well fixed.