What is the Qubes version of "Control Alt Delete"?

If I leave Qubes and the screen goes black upon my return 5 minutes later, then 
I can't interact with anything on the laptop screen.  My mouse works fine but 
the Qubes VM does not respond to any mouse input.  I even unplugged and 
replugged my mouse.

Even the little icons in my lower left and lower right do not respond.  It is 
as if the entire screen, including the Qubes VM manager, freezes.  In such 
situations manually restart the laptop.

What is the "Control Alt Delete" mechanism so i can get a "task manager" to see 
what is happening?

Thank you.

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