Is this a good gaming botebook?

Im going to be getting a dell notebook(got a bunch of good reviews)http://www.dell.com/content/products/productdetails.aspx/inspnnb_1420?

And i have a couple of questions. First, how do i connect to the internet? do i need a router or a wireless internet card?Can i be walking around outside and still have accesss to the internet. And when im at an airport or some other building, can i connect to the buildings router and use the internet?

Second, is this a good notebook to play pc games on, like shooters and other rpg, mmorpg games without lagging or having almost no problems?

And third, is the video card that this notebook brings any good to play games of the genres mentioned above. And also can someone post a list of all the best video cards that i can get to maybereplace this one for a better one.