DSI XL connection query

Hey all,

Little one got a DSI XL from Santa for Xmas and dad got him a multi cart (lots of games!!;)). I have disabled the wifi connection to prevent any updates, but my question is, can he still connect to a friends DSI to play vs modes?

I'm not sure whether the connection is bluetooth, wireless or whatever!

The Dsi uses it's own wifi connection for wireless two player games like Mario Kart, should be ok for local matches.