pset2 is on my web server:
pset2
Sorry about this one -- it literally sat on my desk for a month whilst pursuing other things, err, everything. It's also not finished - I need to add some ground at the end about 'set transaction isolation level' and 'select .. for update'. Next week after I finish moving into my new place I should have a chance, and hopefully write 5.
(Not *all* that much chance, as I will be working on ACS classic henceforth...)