An app has one primary tile, as determined by the manifest, and can at runtime create any number of secondary tiles (subject to user consent) as you'd use to bookmark or pin pages. It is not possible to create secondary tiles without user consent, which
prevents apps from littering the Start screen.
For more on secondary tiles, see
Pinning secondary tiles and the
Secondary Tiles sample. I discuss the subject also in Chapter 13 of my book linked below.
Kraig
Author,
Programming Windows 8 Apps with HTML, CSS, and JavaScript,
a free ebook from Microsoft Press
