The UI tools start automatically where possible:

•	On Windows, the tools start when the Factor executable is run.
•	On X11, the tools start if the DISPLAY environment variable is set.
•	On Mac OS X, the tools start if the Factor.app application bundle is run.

In all cases, passing the -run=listener command line switch starts the terminal listener instead. The UI can be started from the terminal by issuing the following command:

USE: threads [ "ui.tools" run ] in-thread