from my opinion i think :-
the first ques:-
Configure all client computers as ISA Server Web Proxy clients
Why?.... Because
can be manually or automatically configured through Web Proxy *
Auto-Discovery (WPAD) DNS / DHCP
network Properties----->(Auto Discovery)------>Publish automatic
discover information
All HTTP Sessions are automatically forwarded to the web proxy services*
Configure it from Internet options ------>LAN settings(from connections tab)
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