Computer and Communication Unlimited is an electromagnetic software and simulation system development company. We have developed a 3-D parallel electromagnetic simulation software ---- GEMS Simulator ----  that has been successfully used for solving many electrically large and complex problems by combining the computer cluster.  We keep a world record using 4,000 CUPs with 90% parallel efficiency to solve one large electromagnetic problem. We also provide our customers with an optimized turnkey EM simulation system, which integrates operating system, parallel environment, cluster management, network, I/O and storage systems, high performance servers, and parallel GEMS Simulator. Our support team works directly with customers to provide excellent services from problem modeling to simulation, data-post processing and result analyses