Is it normal to see two users on the same tty?
$ who
jidanni pts/0 ...
ralph pts/0 ...
jim pts/1 ...
$ ls -l /dev/pts/0
crw--w---- 1 jidanni tty 136, 0 2007-08-17 00:58 /dev/pts/0
The administrator (Dreamhost) says
You could potentially see many more than that at any given time.
There are other users with whom you share the hosting, as well as
the admins. This is normal.
Yes, many users, but not on the same pts/0?!
ps -u anybody_other_than_me won't show anything, so I can't
investigate further. Perhaps "stale utmp entries?"