Internet installer downloads only applicable features?

Hi,

We have a requirement to enable download of selective components. I would like to know more details on the internet installer package and understand if only the selected components are downloaded form the web server? I see that we have a .html file generated along with a few support files. The Installer also generates a .cab file that contains the bulk of the installable components. Once I invoke the installer by clicking on the HTML page, the installer UI starts up. Now, if I select a few components (via custom install), would these components be selectively downloaded or the full CAB is downloaded and then the components are extracted?

The reason why I ask is, we have a lot of features in our application and they get enabled based on a serial number. Based on a serial number, only a few features will get installed. It would not be very efficient to allow the user to download the full installer to install only a few components. We have a requirement to minimize the amount of content that needs to be downloaded to install the application.

Please advise,
Shoban Jayaraj