XTerm - how to copy/paste into other apps without a mouse with the center button

This is not any "paper" or tutorial, just a quick note that I saved to save myself headaches with laptops or other computers without the center mouse button :)
So, the magic trick is to select a text in xterm, and then you can paste it anywhere you want (ie. Firefox, Opera...) by clicking both the left and right buttons of the mouse (this actually, as said warriant, only emulates the middle click, but who cares, since it works :).
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