So if everything is visible or not, then isn't the cognitive load now on keeping track of all the windows that aren't visible? How do you handle "secondary" win

So if everything is visible or not, then isn't the cognitive load now on keeping track of all the windows that aren't visible? How do you handle "secondary" windows, so like something you don't need right now, but will in a bit, or you're checking in on it or using it from time to time. So then overlapping windows serves the requirements of: - constant visual reminder of which secondary windows you have - but occupying minimal window space so as to be effectively ignorable if you're concentrating on your primary windows - that might be able to show some visual indication in the corner of your eye when focus is required - that can be easily switched to be the primary window when such indication happens, and then back again to the secondary state