The Window menu contains the standard Windows options for working with windows.
 

New Window

New Window command opens one more window of the same file. This is useful when you have a long file and you work with two or more parts of it. In this case you can open the file in a second window, instead of scrolling it up
and down.

Cascade

Cascade command arranges all open windows in a cascade – i.e. the windows are stacked one over the other but their titlebars are visible, so you can always select the window you need.

Tile

Tile command arranges all open windows in a tile – i.e. you see all windows but only a small portion of each.

The Open Files/Windows List

The last section of the Window menu contains a list of all open files and windows (if any). You can click the name of a file/window and this will switch the view to it.