Abstract: A method and apparatus for interactive communication between a first application program and a second application program over a network having delays. The first application program receives a message from the second application program. The message contains a previous state and one or more projected or future states of an object corresponding to the second application program. Each projected state includes a plurality of possible scenarios, each scenario including an associated probability value indicating a probability of the scenario. An updated state of the object corresponding to the second application program is determined based on the received message and displayed.

Abstract: A browser for requesting and receiving documents from a network includes a cache which stores a plurality of documents and has a user-defined storage limit. At least one of the plurality of documents stored in the cache is designated as a keep document. When a document is requested and received from the network, it is stored in the cache. The cache then determines whether the amount of storage used by the cache exceeds the storage limit. If the storage limit is exceeded, the cache deletes the oldest documents not designated as keep documents until the amount of storage used by the cache is within the storage limit.