By questioning structures such as the navigation window and challenging their functionality, net.artists have shown that what is considered to be natural by most Internet users is actually highly constructed, even controlled, by corporations. Company browsers like Netscape Navigator or Internet Explorer display user-friendly structures (the "navigation", the "exploration" are landmarks of social practices) to provide the user with a familiar environment; net.artists try to break this familiarity. Olia Lialina, in "My Boyfriend Came Back From The War" or the duo Jodi, with their series of pop-up interventions and browser crashing applets, have engaged the materiality of navigation in their work. Their experiments have given birth to what could be called "browser art", which has been expanded by the British collective I/O/D's experimental navigator WebStalker.