AS400 (Application System/400) is a mid-range server. IBM released it in 1988 for small, medium, and large web and mobile applications. The IBM AS400 uses a technology-independent machine interface (TIMI) and a platform-independent instruction set architecture (ISA) that compiles with machine language instructions. This allows it to use a 64-bit processor without breaking application compatibility. For more details on the AS400 iSeries, visit the Lansa blog.