Well I just moved to Dallas and won't know anyone at SMU so I'll give you a first hand account in the next week
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Starbucks is across the street . . .I'm not sure if they have free wireless. The entire law school should be wireless soon, and the new dining hall should be wireless so you could get coffee there. Most of the campus is wireless, so if you want to get away from other law students (trust me, you will thank me for this later), you can go to the undergrad libraries, or even outside if the weather is nice. There's also a coffeeshop/internet cafe opening in the student center this month.
Hope this helps.