说明：  未公开的DOS核心技术本书详细解释各种版本的DOS技术手册漏掸的DOS功能。搞系统编程和信息安全的朋友们，抓紧时间下哈
(Unpublished book DOS core technology explained in detail the various versions of DOS technical manuals Shan leakage of the DOS functions. Engage in-system programming and information security, friends, seize the time under the Kazakhstan)