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The number of tweaks and hacks Siri has given rise to is really impressive, right from ports for various iOS devices to playing Piano and serving beer. But there is a very obvious incompleteness in Apple's beta implementation of Siri. You can't open apps, control settings or even know how much battery do you have left.
Israeli developer Danny Lisiansky is working on a project named SiriPrefs, which addresses some of these shortcomings and lets you launch apps and control settings via Siri.