Web Filtering for AD and non AD users

Hi there, We have got Fortinet 310B v 5.0.3. One of our customers wants to setup Fortigate Web Filtering using Security Profiles. They use AD authentication for some users and thin clients for others. The users who use thin clients do not have any AD credentials and get DHCP assigned ip addresses. The web filtering requirements are pretty basic. I know how to do it for the users with AD accounts but how can we implement for users without AD accounts. If I create an identity based policy and apply web filter to it, I know it would work for AD users which would allow/block them for from accessing web sites What I wanted to know is if I used the same web filter and create a simple policy to allow all to the internet, would it allow the non AD users to browse internet as per the applied web filter or simply block as per the previous rule. Thanks Anne