偷天换日--该程序可以使“时光倒流”，即能使有使用期限的软件变成无限期使用，该程序还使用到了设定时间的系统API函数，值得研究。由广东工业大学的网友张德平提供。-misleading -- so that the program can "turn the clock back" that would allow a time limit for use of the software into the indefinite use of the procedures used to set the system time API function, worth studying. Guangdong University of netizen Zhang Deping provided.