Originally Posted By: drakino
ChromeOS would satisfy your build and install application piece, as you can build an HTML 5 based application and install it.

A real multipurpose OS does not rely on a defined, limited set of languages. A real multipurpose OS presents system calls that can be accessed in a generic manner.

Is this a fine line? Yeah. But WebOS (and, I guess, ChromeOS — I haven't really looked at it) really is more of a dedicated application with very advanced configuration files.
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Bitt Faulk