This page acts as a menu for the Apps in your fSeries. Each item opens the corresponding app's Start Url in the browser.
The Application Selector may be added to a menu. For example it could be used as a top menu to allow the user to jump between different applications.
The page is also used as a fall back for when a user logs in to fSeries bad there is no Default User Url and the user is not a member of a group, or their group has no Start Url.