Q: Where to configure TC''s squid?

[Ralf <rgx@gmx.de>]

If I got it right, despite there is no explicit proxy set up for 
konqueror, there is a transparent proxy running on tjener (the main 
server). Now, we want to prevent pupils from visiting non-paedagogic 
web pages (we did this before, so we have the blacklist and an old 
squid.conf). My first try was to configure /etc/squid.conf on the ltsp 
server that serves the thin clients. This didn't show any effects.  Did 
I make some mistake, or was it just the wrong place? 

Any URL to the corresponding section in the manual  should do, a precise 
instruction won't be refused, of course :)

Thanks
cya
Ralf