With its latest feature in Windows 10, currently dubbed "Sets," Microsoft has taken some major cues from what browser makers learned years ago. Basically, it lets you group together Windows apps in tabs. Think of Sets as a mashup of existing and emerging Windows 10 technologies. Take Windows Explorer and the little-used Task View within Windows 10, mix in the newer "Pick up where you left off" and "Timeline" features, and wrap it all into a single-window experience. The idea is that every task requires a set of apps Mail, a browser, PowerPoint, even Win32 apps like Photoshop and those apps will be optionally organized as tabs along a single window.