Showing hidden devices on Windows

Courtesy of the good people of the libusb-devel mailing list:
  1. Set a System (not user) environment variable called:
    DevMgr_Show_NonPresent_Devices with value 1
  2. Tell device mgr (thru menus) to show hidden devices
See http://www.ftdichip.com/Documents/AppNotes/AN_107_AdvancedDriverOptions_AN_000073.pdf

This trick seems to work fine on Windows 7 as well.

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