Their operations are synchronous and the communication and synchronization among them are realized by ECB (Editing Control Block).

• TEG的编辑活动是作为三个并发任务实现的,这三个任务分别处理输入、缓冲区编辑和窗口显示,三者之间异步运行,由编辑控制块实现任务之间的通讯与同步。