"None of these methods, however, are as simple to set up as a standard Web browser, which can quickly access a file from anywhere in the world. That's the promise that AJAX brings to the party." (from AJAX: the way word processing will be)
One very impressive example cited in the article is Writely. It's (of course) free and easy to try. It really seems to work. Of course when it comes to word processing, features matter, but reliability matters a lot too. Last thing I want is to lose the 10 page term paper and not be able to retrieve it. Check it out.
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