A hand held device for use to separately render associated data is disclosed. The hand held device includes a display element, a processor, and a communication interface. The communication interface operates to receive rendering commands of the associated data from a host device, which received the associated...http://www.google.de/patents/US6072521?utm_source=gb-gplus-sharePatent US6072521 - Hand held apparatus for simulating two way connectivity for one way data streams
