For example, if access to contacts is authorized or not determined, then a UI button to pick a contact can be displayed.

ENGADGET: Apple seeds iOS 6 beta 4 to developers: here's the changelog

Luckily, a timely opportunity did present itself in that the French element of the F3 team were in contact with the French Prost F1 team, raving about Button's ability.

BBC: How good is Button?