Windows and other GUI systems give you the ability to cascade your windows -- arranging them in an overlapping fashion, with each title bar visible.
What's the purpose of this? Why would you cascade windows?
This functionality has been included in GUI systems for decades. There must be some use for it, but I've never figured out what it is.
Can you do something useful with the cascaded windows? The only possibility I can think of is using the cascaded windows to locate a particular window.