A computer-based monitoring system provides interactive topology information about a synchronized optical network. Each of the planetary gear sets includes first, second and third members and the planetary gear set assembly includes a first, second, third and fourth member. Rasterized display list blocks are returned to the memory pool. In some cases, the message may be selected based on both context and caller identity. The network elements compare the time stored in the validation information records to the actual modification or creation time of records to verify validity information.