ASTA 基于广域网，实现多层体系应用的框架系统。它提供了基于广域网的数据传送控制及相关功能用它可以方便的实现各类多层体系应用软件。-ASTA system fr a mework based on wide area network, the application of multilayer system. It provides wide area network data transfer control and related functions based on it can rea