A powershell script for using the dell display manager to switch machines. I use it with my U3415W; but it should work with any dell monitor that supports the display manager.
This is a simple powershell script for calling DDM on a 64bit windows machine for switching monitors.
You can follow the installation instructions to use on your machine
For more information on ddm and to download it go here
Change the $monitor variable to the monitor you want to switch to.