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Help app toolbar on left hand side

I have only been using Android for about a week now, so excuse me if I am a bit green about how some bits of it work.

Every now and then I accidentally do something on my phone (Samsung Galaxy S3), I don't know what it is, but it causes a half-moon image to appear about half way up the left hand side of the screen. This image sits on top of all other applications. If I touch it, it causes a toolbar of apps to appear on the left hand side of the screen.

What is this called? What turns this feature on? And, most importantly of all, how do I turn it off once it has appeared? For reasons I cannot fully justify, I find it really annoying.
 
P. S. the Samsung terminology is 'Multi-Window' and yes, as described above it enables viewing and running two apps simultaneously by dragging them from the bar to the centre of the screen, where they will then be placed one above the other.

Since I am no longer running a Touchwiz based ROM I don't use or need it. Frankly I think it's more of a gimmick as the screen size is too small to make any sense -but that's my opinion.
 
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Hold the back button to turn Multi Window On/Off. Hold back to turn it on. Then hold and drag app from the left menu to snap it to the screen. Then choose another and do the same. You now have two apps running at the same time. You can drag the middle bar to make one app larger or smaller. There is also a button to switch between said two apps. Hold back to turn it off.
 
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