Abstract: In a cooperative computer based system for editing a web document including a plurality of clients a server, the cooperative computer based system includes means for generating editing instructions, converting editing instructions to a message related to editing and transmitting the message related to editing to the server; means for determining if the web document can be modified, based on the message related to editing; modifying contents of a copied web document stored in the server in conform to the message related to editing; and transmitting the message related to editing to the plurality of the clients; and means for modifying contents of the copied web document stored in each of the plurality of the clients in conform to the message related to editing transmitted from the server.

Abstract: An information providing system capable of bi-directional targeting and control of information display, this system including a first storage unit for storing user-set data including at least one item among the sex of a user, the age of a user, and the concern area of a user, a second storage unit for storing a plurality of information and information attribution data in which at least one item among the sex of a target to which information is provided, the age of the target and the concern area of the target is defined for each information, a determiner for determining information to be provided to a user, according to whether the user set data is consistent with the information attribution data, and a provider for providing information determined by the determiner as information to be provided to a user, to the user.