It's also a kind of Steam for drivers, if you will, in that it automatically maintains an updated list of drivers for your PC's various parts, only requiring the user to click the install button.

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For weeks now, Blizzard has been offering pre-purchases of the game online, and you could download Diablo 3 in its entirety before release in order to simply click a button and install on launch day, and customers can continue to buy it through them at any time since then.

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It has an application store stocked with Web services like Skype, Boxee and Gmail and users can install applications with one click.

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Anyone who has been asked by a friend or family member to fix a slow PC understands the average home user will happily click any link, accept any friend invitation, and even install software from just about any Web site.

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After that whenever you install a Pokki app, it can be done in one click.

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Once people install the Facebook app, Bobsled installs an icon on their Facebook chat box so that they can click to call any of their Facebook friends.

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