通信双方建立连接后可以双向传输文本信息和各种格式的文件，并且在双方对发文件的同时仍然可以进行双向的文本信息通信。
After the connection is created, the two sides can make a two-way transmission of both text message and files in all kinds of format.
链路是双向的，在两个方向上各使用一个传输和接收对以实现同时传输。
Links are bidirectional, using both a transmit and receive pair for simultaneous transmission in both directions.
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