Abstract: The present invention provides a system that includes a plurality of cache engines coupled to a computer network such as the Internet, and a cache memory associated with each of the plurality of cache engines. The cache memory is allocated to store information of a plurality of users participating in an online communication session. Each user is allocated a normal section and an exception section in the cache memory, the normal section storing predictable behavior of the user and the exception section storing unpredictable behavior of the user. All users' session environment is updated by sending information on whether a specific user's behavior is predictable or unpredictable and by retrieving the appropriate user behavior from the normal or exceptions sections in the local cache memory.