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Skype Widget is a Dashboard widget that lets you dial calls.
Instant Messaging (IM) or chat allows you to communicate with other users with text messages. In many cases, chat may be useful for communicating with other users instead of, or in addition to, voice communication. For example, if you are discussing a website you visited recently, it may be easier to copy and paste a website address into the chat window instead of trying to spell this out during a call.