说明：  一 程序的整体结构 1 拨号功能，自动响应功能。（能使用ATDT命令拨号，使用Ctrl-D退出联机状态）。 2 执行调制解调器命令。 3 仿真终端功能：在线方式可进行联机通信，TTY终端仿真，加载驱动程序后可进行VT100终端仿真。 4 文件服务功能： 文本文件的传输，二进制文件的传输，文本文件和二进制文件的写盘功能。文本文件的阅览和简单编辑功能。 5 终端服务功能： UNIX主机上运行的具有菜单驱动的终端服务程序，客户机可通过终端仿真器访问远程机（Remote machine）资源。 6 访问本地机资源：终端状态时可访问客户机上的资源（阅读编辑文件，删除和拷贝文件，执行DOS命令及DOS应用软
(the overall structure of a dial-up function, automatic response function. (ATDT can use dial-up orders, use Ctrl-D on-line from the state). Two implementation modem commands. Three simulation terminal functions : online communications can be conducted online, TTY terminal emulation, after loading drivers can be VT100 terminal emulation. Four file services : text file transfer, the transfer binary files, text files and binary file write-functional. The viewing text files and simple editing features. 5 terminal services : UNIX running on the mainframe with a menu-driven terminal service procedures, clients can terminal emulator to access machine (Remote machine) resources. 6 visit to the local machine resources : terminal state visit clients on the resources (read edit documents, delete and )