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. Alexei Shulgin and Heath Bunting have played with the structure of advertisement portals by establishing lists of keywords unlikely to be searched for but nonetheless existing on the web as URLs or metadata components: they use this relational data to enmesh paths of navigation in order to create new readable texts . The user is not exploring one art website that has its own meaning and aesthetic significance within itself, but rather they are exposed to the entire network as a collection of socioeconomic forces and political stances that are not always visible. Rachel Greene has associated net.art with tactical media as a form of Detournement. Greene writes: "The subversion of corporate websites shares a blurry border with hacking and agitprop practices that would become an important field of net art, often referred to as 'tactical media'." Hacker culture The Jodi collective works with the aesthetics of computer errors, which has a lot in common, on both the aesthetic and pragmatic levels, with hacker culture. Questioning and disturbing the browsing experience with hacks, code tricks, faux-code, and faux-virus, critically investigates the context in which they are agents. In turn, the digital environment becomes concerned with its own internal structure. The collective 0100101110101101.org expands the idea of "art hacktivism" by performing code interventions and perturbations in art festivals such as the Venice Biennale. On the other hand, the collective irational.org expands the idea of "art hacktivism" by performing interventions and perturbations in the real world, acting on it as on a possible ground for social reengineering. "We can point to a superficial difference between most net.art and hacking: hackers have an obsession with getting inside other computer systems and having an agency there, whereas the 404 errors in the JTDDS (for example) only engage other systems in an intentionally wrong manner in order to store a 'secret' message in their error logs. It's nice to