I agree- this is ridiculous. I popped by the site to check for updates, I notice "apps" subforum of XIM3 and after scouring all manuals, tutorials, etc, I can find NO mention or reference to this area at all.
From looking at various threads, you have to buy an easy transfer cable. I had to dig for that simple information. From that and the fact that the "Apps" run on PC I can guess that this probably is a way to provide support for more USB peripherals (and also convenience of not having to keep unplugging devices all the time?).
Someone create a thread clearly explaining what these are, what you need, etc, and sticky it.