In 2012 we used a linux single-board computer on our robot and had to solve the shutdown problem. There are some details in this document:
http://www.chiefdelphi.com/forums/sh...ght=Kinect+987
Our final solution assumes that you've written a program on your vision processing computer that can respond to packets it recieves from the RoboRio or other computers. Our robot computer (crio at the time) sent a packet to the vision co-processor which caused it to run the shutdown script. We triggered all of this with a button on one of the joysticks at the drive station. For what it is, it was a lot of work to get right but we didn't want that 1 in a million chance of our vision computer corrupting its file system at the wrong time.