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Any computer can theoretically act as a server. These days it's software that makes a server a server, not so much hardware. The bandwidth question depends entirely on how many people you plan on having play at the same time. It may be more cost-effective to just rent the server from one of the many companies that provide that service.
-What is best in life? -To crush your enemies, see them driven before you, and to hear the lamentation of the women.