Live Time in Windows 8

Question

There is an app in Windows Store called "The Time" which shows current time (every minute) on its Tile. The app can do this without registering any Background Task.

How can it do this?

UPDATE: it seems that it schedules lots and lots of tiles! Because if you draw back the computer time, it will stop working. However, I don't know how many tiles it schedules and how many tiles it is possible to schedule?

Answer 1

From the author himself:

1. Live tile updates may be scheduled
2. Applications may be given slices of time via the background task infrastructure

So, simply, when The Time’s background tasks are executed by the OS they queue up a number of live tile updates.