Apple showed off its latest computer operating system, OS X 10.11 El Capitan, at WWDC and as predicted it was an iterative upgrade, based around improving the core features of OS X and providing a better experience to users. Just like iOS 9, El Capitan takes the essentials of OS X ? Safari, desktop management, Spotlight ? and makes them better, tweaking the interface or reworking it slightly. Microsoft's Windows 10 is coming at the end of next month and brings with it a whole new set of features, many of them iterations on Windows 8.1. Both new operating systems will be available for free to those who have already got OS X 10.10 or Windows 8 (both have support that extends even further back from this) and the general theme of improvement runs through both. In this article, we are going to gauge how El Capitan's new features stack up against Windows 10. Pin tabs in SafariApple's WWDC keynote spent a fair amount of time talking about improvements to Safari. While many users have switched over to Chrome, the Mac client is traditionally a battery killer and the redesign that OS X 10.10 Yosemite introduced won back support. One of the key features that Apple introduced with El Capitan is the ability to pin tabs, making for quick and easy access. The bookmark system of the current incarnation of Safari (version 8) is a little lacklustre and so it's good to see Apple is thinking this through. Windows 10 introduces a much needed change, ousting Internet Explorer and replacing it with Microsoft Edge, a new and fresh browser that attempts to shake off the reputation of IE. We know relatively little about Edge as it is still in the development stage but it doesn't seem to have any way to pin a tab.