Disper is an on-the-fly display switch utility. It is intended to be used just
before giving a presentation with a laptop, when all one wants is that the
beamer, which has just been connected, is able to show whatever you prepared.

Disper gives you the option to either clone all detected displays, or extend
the desktop to them. Resolutions are automatically detected. For cloning, the
highest common resolution supported by all displays is chosen; for extending
every display device gets its highest supported resolution. For special setups
requiring more detailed control, one can still use the standard display
configuration utilities.

At the moment nVidia cards are supported, and a basic XRandR backend is in
place.