Deny a trusted program on-line privileges

Question concerning Comodo Firewall: How can I give a trusted program (as in Winamp or any program I know & trust) full access to my system while off-line, but “deny” the program any on-line privileges whatsoever? i.e. as in prohibit the program from calling home, etc.

A ZoneAlarm refugee,

so you just want to block winamp internet access?

go to firewall tab and click “define a new blocked application” and select winamp