直接用于关闭操作系统，方便简洁快速实用。直接调用系统函数。实现比较容易-directly to the closure of the operating system to facilitate rapid practical simplicity. Direct call functions. To achieve easier

用XML和TreeView实现无限分类的递归调用，主要是用在管理系统下面的。利用frame框架做的一个小示例-Using XML and TreeView classification unlimited recursive calls, is mainly used in the management of the system below. Framework for the use of frame to do a small sample