I wasn't real sure what forum to put this in but I think this will work. First I'll say what I'm trying to do and then you can help me with the Windows part of it. I want to filter out people that visit a certain portion of my web site. That way I have a little control over who visits. Down the road, I'm going to have people pay for access to the site. I've seen PHP scripts were you can allow or block certain IPs to a site. I want to do that but instead of IPs I want to go by the browser information submitted (HTTP_USER_AGENT on PHP). I know there is a key in the registry which can add thinsg to the User Agent but I forget it. Does anyone remember it? I went into two IE folders but can't find it and I think I remember it being in a weird place. Thanks.