If you like to work with multiple Editor windows that each contains a single file (rather than opening the files in the same Editor window), you might want to customize the Editor to make the NextWindow command (see "NextWindow") easily accessible. You can use this command to cycle through all of the Editors that are currently open on your computer. To learn how to add commands to the Editor through menus, buttons, mouse clicks, and keystrokes, see Chapter 9, "Configuring and customizing MULTI".