At the lowest level, computers can only send 1s and 0s to each other. In order for two computers to communicate, they must agree on what the 1s and 0s represent. In MSN Messenger (except in file transfer), they represent characters, such as "Latin Capital letter A", "Digital Four", or "Runic letter short-twig-sol". In other words, MSN Messenger is a text-based protocol.
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