在DOS系统本身是不支持多任务的,此源程序为在DOS下实现多任务的简单例程-In the DOS system itself is not support multitasking, the source program to implement multitasking under DOS simple routines

用TC2实现的DOS多任务功能,包含全部源代码,不错的源码-TC2 is used to implement DOS multitasking function, including all source code, source code