Cisco offers its CTE 1400 series Content Transformation Engine appliance, which enables enterprise and service provider customers to deliver existing Web content to a variety of new devices, including WAP phones, PDAs and Cisco IP phones. The single rack-unit appliance converts HTML and XML data formats appropriate for client devices with special display requirements. It can be used to mobilize intranet and extranet applications, providing access to on-line information from virtually any client device. It can be deployed in enterprise and service provider environments using existing HTML and XML content. It functions as a reverse-proxy, acting as a Web server to the client device and as a client device to the Web server.Using software from WebUnwired, it transforms the content properly for each device type sending only essential information formatted to fit the screen and memory requirements of the specific requesting device. The device works with most routers, switches, server load balancers, content engines, Web servers, firewalls, VPN solutions and IEEE 802.11b wireless LAN products. Each unit supports up to 10, 000 simultaneous users and 1, 400 concurrent active sessions. Through a GUI-based tool, CTE Design Studio, rules can be defined for how Internet, intranet or extranet content will appear on a specific client device. Once created, these transformation rules can be modified to suit other document types or devices.