| http://www.w3.org/ns/prov#value | - apanese Laid-open Patent No. 9-182046 discloses a system in which an interface control program is provided for uniformly controlling the modules of the individual communication tools in order to mutually link the communication tools such as electronic mail, viewphone or whiteboard. [0012] In this system, the viewphone screen and whiteboard screen are displayed on a same screen.
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