Most of us either use IM, or know about IM. Instant messaging is one 'high-velocity' tool by which we can beam photos, spreadsheets, hyperlinks, and simple notes to other people's computers. Faster than email, with elements of chat, IM has become a valuable business and social tool. But how exactly does instant messaging work? Brandon De Hoyos has put together a splendid illustrated guide to explain how IM works here.
(Image/Brandon De Hoyos, About.com)