操作系统的实验，用于初学者的学习。里面包含了进程线程，查找文件和unix的shell等四个实验。-An experimental operating system for beginners to learn. Which contains a process thread, find the shell file and unix four experiments.

The CronJob component is the thread-based alarm implementation for Delphi/BCB which acts like cronjob utility in Unix. The component produces periodical OnAlert events by schedule specified in CRON format (actually it uses extended CRON format