Basic (probably stupid) question about APExp

Hi, Just one quick question. The Wi-Fi connection provided by the built in airport in my iMac covers my whole living room, but since I have many apple devices using that same NetWork, sometimes it fails. So before I buy an aiport extreme, I would like to try the airport express, and my question is: The airport express connects (and amplifies) to the wi-fi network of the iMac, so how do I know on which airport am I connecting with my other apple devices? I don't know if I was able to be clear. Thanks a lot!

Just one more question. If the APExp creates a new wifi network how do I have internet in all The devices?
Is it possible the following network configuration?:
iMac - cable - modem ( existing already) - existing AirPort - AirPort express - wifi (with internet) for all the other devices ( iPhone, apple tv, MacBook, ps3 )?
My idea is to have all this devices in network ( sharing files, playlists) with internet access ( which is phisically connected to The iMac)
Is it possible? Or do I have to buy an AirPort extreme AND an AirPort express ( since I have to have a cable To my ps3...And my wife is bugging me about The LAN cable across The living room?) . Thanks

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