Better discussion of membership levels on SDF. This is a toughie to do because this is mostly an introduction to unix, with only some SDF-specific goodies, not a full SDF policy document. Maybe it would be suitable to mention that any unix system might allow only certain users to run certain programs, & I could give brief details of SDF's membership levels. This was requested or suggested by at least two people on //bboard// / GENERAL, so it's not a frivolous request. Hmmm...