Webscribble webdate software custom mod needed

I am looking for a custom mod for the Webdate software by webscribble. Here is a link to there site so you can see the software. [login to view URL] What I need done is I have 2 sites that both run off the same database and members but both sites have different names. So what I need is so that the webdate software know what site the member is from and makes sure to send out e-mails with that sites name on it. So for example someone signs up at site AAA I need all the system messages they receive to say site AAA name on it and if someone sites up for site BBB it shoul list BBB name on it. Also if someone sends a person from AAA a message but they belong to BBB the system message that the person receives should say it is from site AAA. Right now since they both share the same database the same system messages go out to all people no mater what site they are a member of. What I am thinking might need to done is that members that signup from site BBB need to have an extra marking in the database to say they signed up for site BBB and so the system will then check for this before it sends letters to see which letter it should send. I am not sure if this is how it should be done or not I am just thinking. Also I need to have instuructions so that If I decide to add more sites in the future that I can make them work as well.