I succeeded to resolve this issue. Basically, I have one Web site responding to various domains. In IIS, I defined my main Web site. For each other Web site that need to be processed as is, I simply add an entry in IIS to simply point to the other site, as per the Local Path setting. Then, on entry, the first thing is to extrapolate the URL so I can know from which domain it came from. Then, based on the domain detected, I can setup various properties that will have the page to be processed as per the domain used.