通信系统（虚拟电信访问方法）是一个IBM应用程序编程接口（API）与电信通信设备及其使用。
VTAM (Virtual Telecommunicatio Access Method) is an IBM application program interface (API) for communicating with telecommunication devices and their use.
通信系统（虚拟电信访问方法）是一个IBM应用程序编程接口（API）与电信通信设备及其使用。
VTAM (Virtual Telecommunicatio Access Method) is an IBM application program interface (API) for communicating with telecommunication devices and their use.
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