>Is it possible to logon to a Winnt or Win95 machine from a win95 dos mode through a 10Base-T network?

This is a guess. I'd say that if the server software (NT or Netware) provided DOS support for logons, sure. But I'd also point out that this is based on my experience with Novell 3.1x. DOS isn't the real OS anymore under 32 bit Windows.