Abstract: A system and method adapted to linking a group of client stations such that the operator of one or more client stations can guide or dictate, at least partially, what is viewed on the other client stations. A first user of a client station may guide and restrict the browsing of URL resources of other user client stations. The first user client station transmits a URL resource identifier to a server station, which then sends the URL resource identifier to authorized users of a group. The client stations of the group users are then directed to the URL resource submitted by the first user client station. The system allows a user of the group to annotate the URL resource or web page, and such annotation is contemporaneously displayed on each of the group client stations.

Abstract: An apparatus for categorizing objects employs a neural network having a plurality of cells each having memory for storing a state variable, and a plurality of synaptic junctions connecting cells of the network and having memory for storing a synaptic strength variable. A computer is used to modify the synaptic strength variable in accordance with a heterocellular synaptic modification rule. That modification rule includes both the passage of time and the values of the state variables of each cell and of those other cells having specific spatial locations with respect to the cell in three dimensional space.