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re: When I click on a tab, what do I call the new "piece" of screen
displayed that was previously hidden?
Sounds like you're on the way to being too wordy. Why not just something
like, "When you click this tab, information on X is presented?"
Who cares what it's presented on? It's presented on the user's monitor
screen, actually, in the pixel range x1,x2,y1,y2, but you never would say
that. Conserve words, say I.