实践证明了用中断实现前后台切换、对DOS重入问题的处理、嵌套和屏幕保护等都是有效的解决方法。

The practice proves that interrupt is a useful method for foreground -background exchanging, the DOS reenter processing, the embedding and screen contents saving.

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同时，针对前后台数据处理白勺实时性差异，给出了共享内存白勺通讯任务实现。

Simultaneously, in order to resolve the questions of real-time data processing, implementation of Shared memory communication tasks is also given here.

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