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purpose and usage of secondary-selection ???

From: ken
Subject: purpose and usage of secondary-selection ???
Date: Tue, 13 Sep 2016 15:15:58 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2

Sometimes while typing on my laptop I accidentally brush against the touchpad and inadvertantly mess up something. Today, while not even emacs, this happened, affecting what happened in an emacs frame which previously didn't even have the focus.

What I ended up in that emacs frame was that a random section of text was set to background yellow. Investigating further, I found that text with the yellow background was a secondary-selection. But I couldn't find anything in the Help screens describing anything about it, except its properties. So here are my questions:

What is/are the purpose(s) of a secondary-selection?

What can be done with a secondary-selection...? and how to do them?

How do I undo this secondary-selection... i.e., make the selection go away without changing the file/buffer in any way?

Thanks much.

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