本文介绍了一种用微型计算机IBM-PC/XT和一块XENIX四接口卡实现的点与多点间的后台通讯方案，并且详细介绍软件的实现方法及技术要点。

In this paper, a scheme about background communication between one microcomputer and others by IBM-PC/XT and XENIX is introduced, The softwares and the main points of technology are described.

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