Since I bothered everybody with my question on concurrence, I feel
obliged to admit how apparently dumb the question was. I now know
that the "secret" of concurrence is that each user must be logged
onto a separate account when using GRASS. To do this only seems to
require a path like the following be set in .cshrc:
set path = (/home/CGEF/grass/4.0/bin)
Our problem was simply that we started with one account called grass,
and more than one user was logged onto the grass account at the same
time, and we were both trying to use monitor x0.
Greg Colello
Carnegie Institution, Department of Plant Biology
Stanford, CA 94305
gcolello@biosphere.stanford.edu