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Instant messaging is - well, instant, as you can see on Zack's screen.
You can send and receive files, documents and attachments, just as you would be able to do in any other instant messenger.
And if it is required, you can jump from an instant message conversation through to a phone call with one button. Of course, if you have physical devices like cellphones and IP phones linked into your network, then you can redirect to another computer or phone.