The Windows dialogue box explained

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Select Window Activate OK Save Close Window(s) Cascade Tile Horizontally Tile Vertically Minimise Help
Select Window
Lists all of the currently open windows.
Activate
Activates the selected window in the Select Window list. You can also activate a window by double-clicking on its filename in the Select Window list.
OK
Closes the Windows dialogue box.
Save
Saves the selected file(s) in the Select Window list.
Close Window(s)
Closes the selected window(s) in the Select Window list.
Cascade
Cascades the selected windows in the Select Window list.
Tile Horizontally
Horizontally tiles the selected windows in the Select Window list.
Tile Vertically
Vertically tiles the selected windows in the Select Window list.
Minimise
Minimises the selected window(s) in the Select Window list.
Help
Opens the help page you are looking at right now.