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    I'm not sure about automatically detecting it, but you can use Windows+P to pull up the display switcher applet. Your video card driver also might let you configure a hotkey to switch between display modes (e.g., switch between extend and clone, or extend and single).
    – rob
    Commented Apr 23, 2012 at 13:56
  • @rob: I've been using that for a long time now, but it's not bulletproof either. I've had applications start on my "ghost" second monitor even when it's not connected. That was before W7 and the Windows+Left/Right arrow.
    – Terry
    Commented Apr 23, 2012 at 15:08
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    Some video card drivers and utilities also allow you to force new windows to open on a specific monitor...perhaps that would suit your needs.
    – rob
    Commented May 18, 2012 at 6:42
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    To add to Rob's comment, do you have nView installed? Right click on the desktop, and select nView Properties. Enable nView if not already enabled, then check out the Windows tab. I've tried Prevent windows from opening off-screen without success. As Rob said, you can also change Open windows on to your primary display. Will that work? Commented May 18, 2012 at 15:43