In wireless it can...
-entralink- go to other peoples worlds to earn pass power and helpful stuff to use along your journey
-Extranseiver- (DSI)-talk and video chat with people
In Infra red it can...
-Feeling check- tell people how you feel about things
-Trade- trade with two DS next to eachother straight from your boxes
-Battle- battle friends next to you
-connect to internet to go to dream world
Also you can help eachother battle if your a t gear station (Through wireless and infra red only)-Multi (Wi-Fi train)-people over internet