One word of caution: the HP9000 machine I'm using for testing is located in the USA and Internet access is relatively slow. I have managed using an X-client, but response times make this a fairly impracticable option.

That's a bit far away. I've got one in my garage. Mine runs Debian though. If you wanted to borow it you'd have to supply your own copy of HP-UX. Nice machines - mines got dual 64 bit RISC processors. Wayne