[kirkmc adds: We ran this as part of a Mission Control tips hint last year. But that hint is actually incorrect; this does not "Quick Look [a window's] content," but rather zooms it. Quick Look is a very specific display which allows you to scroll through multi-page documents, view videos and more. If you use this to zoom in Mission Control, you cannot scroll; for example, if I zoom the BBEdit window in which I'm editing this hint, I can't then scroll up or down in the window, as I could if I Quick Looked the text file in the Finder.]

