What does the GEM do?

In the botton right corner of the World Editor, there is a little gem that you can activate. What does it do?

As far as I know:

-When you kill a unit it plays its death animation, and death sound for certain units.
-Sometimes selecting a unit will make it play one of its "ready" sounds or "pissed" sounds.
-When you click it rapidly you piss off the WE and it says stuff.

Otherwise, nothing useful. But its fun to make a million units then kill them all at once.

Also, if you delete a unit that has the "none.mdl" or no model file at all (Appears as a big green/black box) with the gem on, WE bugs out and leaves the checkered box, which then cannot be selected, because it has no death animation. I think this can be fixed by savin, rebooting WE, and reloading the map... but that remains to be tested.

What does the forum's search function do?