基于DOS系统下的多任务类库。Class DOS Thread provides a framework for writing DOS applications-DOS-based system under the Multi-task library. Class DOS Thread provides a framework for writi Vi DOS applications

定时器类，独立线程运行，采用消息机制通知处理线程。精度1秒。-Timer class, thread running independently, using messaging notification processing threads. The precision of 1 second