When requests are made for any Personal Tier application files, done through a custom protocol scheme, urlmon activates an Asynchronous Pluggable Protocol (APP) handler. The APP, which is registered as the sole handler for the Personal Tier protocol scheme, then sends the request so that the URI of the requested file is mapped to the correct local handler. The request is then handled appropriately.
The APP also provides the browser with the appropriate security zone for the given application based on information stored in the Personal Tier local registry.
See Also