Patent attributes
A client machine initiates a browser instance of a browser. The client machine selects a first user identifying state for the browser instance prior to accessing any web pages by the browser instance, wherein the first user identifying state is associated with a first data structure set that comprises a first browser history, a first browser cache and/or a first cookie that are stored at the client machine. The client machine uses the first user identifying state in a session between the browser instance and a server. The client machine updates one or more of the first browser history, the first browser cache or the first cookie of the first data structure set based on the session without updating a second data structure set associated with a second user identifying state.