which access point is my computer connecting to...networking question

Hi every1.

I'm wondering if there is a way to tell which base station I am connecting to my network through.
my setup is one timecapsule which is creating the network and it is extended by another airport express through ethernet. The network is 5ghz N only if that makes any difference. I was wondering if there is an application or some other way (terminal??) of finding out which one my computer is connecting to.

Thanks in advance.

 

Thanks alot works perfectly!!!