Various features for a computer operating system include mechanisms for operating where a single native application, in the form of a Web browser, exists for an operating system, and all other applications run as Web apps of the browser application. A computer-implemented object tracking method includes instantiating, a first time, an operating system object on a computing device; automatically identifying contextual meta data that defines a state of objects that are open on the computing device, other than the instantiated operating system object, when the operating system object is instantiated; and storing the identifying contextual meta data in correlation with the operating system object, wherein the contextual meta data identifies one or more objects that are active in the operating system when the operating system object is instantiated.