Which software lets me blank out everything on the screen, except for a small window view?

Raj July 1, 2010
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I am not sure how to put it or how to name this functionality. So here goes. I am looking for a freeware which would do the following:

Say I am watching a YouTube view I want only that video window to be visible, rest to be say dark or opaque. They have/had a functionality called lights off. It’s available on Hulu and many other sites now.

But I want a general software for Windows for this functionality.

Any help would be appreciated.

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