This link is too important not to post.
It essentially guarantees network access for any DOS machine that will run MS-DOS 5.0 or better. One disk can setup any machine you can scrounge up to do networks including file sharing.
While you're at it, have a look at this, supposedly the most stable embedded UNIX style operating system in existence ... Minix 3. Read some of the papers by the author, it is designed to be faultproof and instantly bootable.