i got my airport express up and running following the setup instructions: making it join to existing wireless. now i can use wireless internet and airtunes, but how do i check how its setup? like what is connected to what? basically, i want to my macbook to connect to my other wireless router for internet, and also connect to airport express for airtunes for best connectivity results. i do not want my macbook to connect to my router which is in another room and then that is connected to my airport express which is in my room. how do i check this?