Ive tried using a tiny Wifi adapter made by Tenda I bought for and used in my Openbox X5. This was recognised in the rear USB port of my 202e but I did have probs with it. This would connect to the router and work fine on Youtube etc but it would not connect to a server. All other functions including using the PC browser to access the box worked fine just no emu connection. So the rear USB slot should at least be active for some USB Wifi dongles. Hope this helps
Just tried it again quickly and I can confirm you should get a popup message as you plug it in and as you pull it out but it works and immeadiately reconnects to the router via wifi.