Is it possible to set up an Airport Express as a wireless "dongle" of some sort? Ie connect a device via ethernet in order to make it wireless? And then in turn connect the AE wirelessly to an existing wireless router? Thanks for any and all clues
The AirPort Express can act as a single Wi-Fi interface to any computer or almost any other devices such as game consoles that has an Ethernet port but doesn't itself have built-in Wi-Fi, thus making the connected device wireless.
you'll want to set it up to join your existing wireless network.
it's much easier (and less prone to problems) to connect it wired to set it up. you can plug an ethernet cable directly into a computer, or your existing network. get it all set up and happy, then unplug it and move it to the location you want to use it.
the older G only version won't work, shouldn't be a problem as they are all several years old by now, but just in case you try to buy of ebay or something.