Microsoft has outlined how it might use the little publicized 'kill switch' in Windows Phone 7 handsets. 'We don't really talk about it publicly because the focus is on testing of apps to make sure they're okay, but in the rare event that we need to, we have the tools to take action,' said Todd Biggs, director of product management for Windows Phone Marketplace. According to Biggs, Microsoft's strict testing of apps when they are submitted for inclusion in Marketplace should minimize kill switch use, but he explained how the company could remove apps from the marketplace or phones, when devices check-in to the system. 'We could unpublish it from the catalog so that it was no longer available, but if it was very rogue then we could remove applications from handsets - we don't want things to go that far, but we could.