You can configure MULTI to use a third party version control system, such as RCS or ClearCase. See Chapter 4, "Version control" for information. If you are using a third party version control system other than RCS or ClearCase, MULTI does not have built-in support for it, but you can provide partial support yourself by creating menus which invoke your version control system as a shell command. For more information on invoking shell commands from editor menus, see "Using the Editor with third party tools".