First I wanted to test chromecasting from a laptop. This could be useful for our classes that use Chromebooks, or teachers that need to hookup via HDMI for some reason. Our current connections from the wall to the overhead projectors is only VGA and RCA. On the few occasions we've had presenters with only an HDMI port on their laptop (no VGA), we had to run a long HDMI cable from their laptop to the projector.
Once you have it set up, you will have to download the Chrome browser extension to get it to work from your computer.
Once you install extension, once you are in Chrome you just have to click on the icon at the top right address bar and choose the Chromecast you want to connect to. As long as you are on the same wireless network you can connect easily.
I also took the device home and installed to a TV, just to test it, and it worked easily the first time out. The only concern I had with the install was that my TV didn't have a USB port, so I had to use the power adapter, and fortunately it was close enough to use the included USB cables.
Everything is working great now!