[K12OSN] Changing proxy settings

[ssanders at coin.org]

hi richard and rick, i am in columbia mo...

i used squid for a couple of years, to (apparently) speed up dialup
users. i didn't have K12LTSP going at the time, so i manually altered
the individual browser settings to proxy through it, a moderate hassle.
i also used it to block sites that were unappropriate by constantly
editing ACL lists, and redirecting everything that failed to a 'purty
404' page. in that situation, i had to run it on a separate machine. an
old PII with 512 meg of RAM was more than adequate. i have not used
dan's guardian, but have read that it's better/easier as far as blocking
sites.