Jim Hall (2985) writes "In a June 29, 1994 post in comp.os.msdos.apps on USENET, a physics student announced an effort to create a completely free version of DOS that everyone could use. That project turned into FreeDOS, 20 years ago! Originally intended as a free replacement for MS-DOS, FreeDOS has since advanced what DOS could do, adding new functionality and making DOS easier to use. And today in 2014, people continue to use FreeDOS to support embedded systems, to run business software, and to play classic DOS games!"
I've never been canoeing before, but I imagine there must be just a few
simple heuristics you have to remember...
Yes, don't fall out, and don't hit rocks.