It sounds simple enough. Display your digital photos on the TV, or play songs stored on your PC through your stereo. Don't bother trying, though, because the typical computers, DVD and MP3 players, cameras, and televisions that pervade millions of homes can't all communicate with one another. After years of industry promises, however, that could be about to change. The first products that will allow for easy networking of a wide range of gadgets could arrive on store shelves as early as this holiday season.

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