Toggle Primary Display
 

This request might be a bit off topic, but if anyone knows, it would be this forum...

Since I can't launch Quartz applications against my DL USB display, I have to first launch the app with my HDMI monitor set as primary, launch the app, then switch the primary to the DL USB display. Why I do this is another matter which I can clarify if needed.

Anyway, does anyone know how to quickly toggle primary displays using the keyboard rather than dragging that annoying little menu bar back and forth in the display preferences?