I thank greatly the input and bug reports I got from Bill Hawes during the
development of the 2.0 DOS and it's shell interface.  It's still extremely
ungainly, but it is now usable.

I also thank Michael B. Smith and Jesper Steen Moller for taking the
initial confusing Usenet article I posted and making working shells from
that information, and John Orr for making me write this article and
producing the example (which helped make me clean up confusing points in
it).