This month, we've 21 brilliant tips to help you master iOS 9. We also reveal how to go back to Yosemite if you've tried out the El Capitan beta and realised that it's not for you, and show you how to run Windows 10 on a Mac. Plus, we continue our guide to OS X System Preferences and look at the history of Apple. All this, as well as the usual mix of reviews, and Mac and iOS tips and tricks.