As the number of different content types in the Internet is increasing as nell as the number of terminal types, the heterogeneity of both content and terminals has become a problem. A common solution is to convert the content to a suitable format fur terminal application either in the server or in the client. More sophisticated solution is to use static proxyservers in order to adapt the content, in real time and inconspicuously. However, if the terminal is a mobile device, the static proxy-servcrs are unable to accommodate to changing characteristics of network (i.e. topology, bandwidth, delaj's ete). Active networking enables the proxy-style adaptation but also meets the special requirements of mobile devices. At VTT, an Active Network (AN) system called LANE was developed. The LANE system introduces content converting active application. With LANE based implementations, it is passible to reach more ciliciently located and more transparent adaptation compared to the conventional static proxy scrvers. Currently LANE introduces a demonstration, in which the Microsoft Word document is converted into other formats.