You can further customize Setup by having Setup detect whether a component exists and by fine-tuning which components users can add if they customize Setup.
Optimize for Web download
Setup can detect whether the same version of a component is already installed on your user's computer. If a version of the same component is already installed, and it will work with Internet Explorer 5, then Setup will not download it. This can save download time.
Prevent users from customizing Setup for specific components
If your users can customize their installations, but you don't want them to customize specific components, clear the check boxes for the components that you do not want users to be able to customize. Force Install will appear in the right column beside the components that will automatically be installed with the browser.