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You Shouldn't Have a Problem
Unless it is midterm or finals season, you are most likely to have a computer at your disposal whenever you are in need. Northeastern's printer costs ($40) are built into every student's budget per semester and you can find the printers right inside the library next to a number of labs. But if you don't buy your own nor desire to brave the cold one night in the harsh winter, you can always ask to use one of someone in your hall. Perhaps the quality (on average) of the computers could use some improvement, as they are a little outdated, but they are nevertheless satisfactory and won't cause you many problems, if any.
I have never had a problem with NU's wireless network, whether I'm in a dorm, the library, on the move (using my phone), or wherever; the network adequately serves our entire and enormous campus. And although I don't know much about the intricacies of network speed, "NUwave," as it is called, seems equal to or faster than any other I've used, and certainly faster and more reliable than the one I have at home. Just make sure you don't do anything illegal on "NUwave guest," or you might get into some trouble...rumor has it that the FBI is watching since it is technically a public domain...or something like that.