Extending my desktop via y splitter in Win 7


Please confirm that a windows 7 desktop cannot be extended across multiple monitors via a common vga or dvi y splitter. Right now it only clones, and doesn't extend. So is the box of y splitters I have just a pile of junk now?
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More about extending desktop splitter
  1. To extend your desktop across two monitors, you need a vga card with 2 video out ports. Any splitter is only going to clone the signal, no matter what the source.
  2. This is a lie.
    Emphasis on the extended desktop function of this vga splitter.

    I also use one at work, a basic cable only vga splitter, with an out dated Dell desktop with one vga output getting an extended desktop.

    I don't understand where this myth came from...
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