Cisco Firewall :: ASA 5520 - CSC Blocking Using IP / Users

I am new at ASA 5520 and CSC module (version 6.3). I would like to know what configurations are possible for my network users if i use the CSC trend micro blocking using IP address or AD users, I know that i could select users/groups from the windows  AD or select the IP addresses that i want to use for blocking or permit HTTP traffic (URL, etc).

My question is on the client side, how the CSC knows what AD users is the one that is requesting certain HTTP pages, or if i user a proxy server, i lose the IP/users options on the CSC??..or i could use authentication options on the proxy for example?.

I have been looking information about this but the manuals only explain the configuration options that i could configure on the CSC Trend Micro page, but it doesn't say which network environment i could use or need.