Interlnk, as njroadfan mentioned, is actually written by the same company as FastLynx.I'm pretty sure the WinBook has DOS 6, will take a look at that as well. Either way, I'm buying a laplink/null modem cable. Which is faster - Serial or Parallel? Pretty sure it's serial but just want to confirm.
The only requirement is that you have another DOS machine on the other end to run Intersvr.