什么是开个DOS窗口键入 TRACERT 怎么用啊

就是开始菜单→运行→CMD
Usage: tracert [-d] [-h maximum_hops] [-j host-list] [-w timeout] target_name

Options:
-d Do not resolve addresses to hostnames.
-h maximum_hops Maximum number of hops to search for target.
-j host-list Loose source route along host-list.
-w timeout Wait timeout milliseconds for each reply.

在开始→运行中输入CMD→回车（这个动作是运行根目录下的某文件CMD也可以是其他的命令）;