IBM Security Directory Server is an enterprise directory for corporate intranets and the Internet. Network-based firewalls are positioned on the gateway computers of LANs, WANs and intranets. Private enterprise networks may use a combination of intranets and extranets. Google Sites provided a simple new Google Apps tool for creating intranets and team websites. Circa 1994 traffic exchanges moved from corporate intranets to the web. Most corporate intranets consist of a high speed backbone network. Folio had its roots in local area networks, "intranets", and CD-ROM publishing. It can be used for intranets, extranets and internets. Chitnis gave talks on data communication in Indian industry, the Internet and intranets. Corporate intranets began gaining popularity during the 1990s. Common uses included project communication, intranets, and documentation, initially for technical users. The classrooms are equipped with multimedia devices, intranets, and Wi-Fi services. TWiki was aimed at large corporate intranets. Intelink is a group of secure intranets used by the United States Intelligence Community. Like Cristian's algorithm, it is intended for use within intranets.