'can't open display'

[brianj]

If I connect to our group's computing system on my iPod Touch with
pterm 2.2.1, and then try to run an X-windows program such as xclock,
then I get a 'can't open display' error message. Can some X-terminal
expert tell me how to avoid this problem? I _can_ run X-windows
programs from my Mac OK, by opening up X11 and sending an ssh -X
command, but I can't use that approach on my iPod.

[brianj]

No need for anyone to respond to that, as one 'Alice' has emailed me
indicating (as confirmed by our computer manager) that pterm does not
in fact purport to do what I was hoping it would do (what it can
usefully do that the free TouchTerm can't seems a little nebulous but
no doubt there is the odd difference).

Brian