I am using elements of Shalla's blacklists to block content. However, they ship in two files, domains and URLs, the former being IP addresses and the later URLs. Since our squid proxy is running on Windows I would need to experiment with cygwin to get SquidGuard running, and that isn't something I have time for at the moment, so I am trying to plug in what I can without crippling performance (and what is the likely performance impact?). Do I call both files via acl {aclname} dstdomain {filepath}, or should IP lists be called using a different command? Paul Cocker IT Systems Administrator TNT Post is the trading name for TNT Post UK Ltd (company number: 04417047), TNT Post (Doordrop Media) Ltd (00613278), TNT Post Scotland Ltd (05695897),TNT Post North Ltd (05701709) and TNT Post South West Ltd (05983401). Emma's Diary and Lifecycle are trading names for Lifecycle Marketing (Mother and Baby) Ltd (02556692). All companies are registered in England and Wales; registered address: 1 Globeside Business Park, Fieldhouse Lane, Marlow, Buckinghamshire, SL7 1HY.