Using 256 ptys is quite plausible. The machines that I look after have
occasionally had over 64 simultaneous users. Allow two or three xterms
per user, and the odd pty for emacs, script, and ytalk, and 256 ptys
starts to look a little on the small side. Fortunately, users
typically don't start more than one xterm, so in practice you don't
use quite so many ptys.
Peter
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