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What does CTRL-WIN-SHIFT-B do in Windows

I'm using Windows 10 and today I accidentally hit the key combination: CTRL + SHIFT + WIN + B.

As a result, the screens went black for about aa second and I heard a beep.

This is reproduceable; every time I hit the aforementioned key combination, the same behavior occurs.

What is this key combination used for?

1. This key sequence actually restarts you graphics driver.

2. It does appear to discard the disktop surface buffer and re-create the allocation from DWM (on a healthy system the desktop goes black for a second).

3. CTRL+WIN+B > Switch to program that displayed a message in the notification area.

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