i tried to mail this, but it didn't work. this info is now
about a month old...
re the note about CLX in 6-5:
the latest version of CLX in export.lcs.mit.edu:/contrib
was CLX.R5.02.tar.Z; the changes include some support for
X authorizations.
re XLISP in 4-0:
the latest version is at glia.biostr.washington.edu:/pub/xlisp,
as xlisp21e.tar.Z and xlisp21e.zip
bikini.cis.ufl.edu:/pub/src has only xlisp21d.tar.Z and xlisp21d.zip