Duplicate Windows is a Mac OS X tool that allows users to visually copy any window live and on-the-fly. It is useful for presentations, as it enables users to display windows across multiple monitors in extended desktop mode, or to keep an eye on windows while watching web videos. Duplicate Windows lets users select from among all window objects known to the operating system, and the new copy changes its size to match the window they have chosen. Resizing the new window maintains its aspect.
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A free program for Mac, by Pocket Bits LLC.
