Detours 作为微软研发并开源的API HOOK框架，在微软内部以及业界有着广泛的使用，正如它的官方说明一样：
Detours is a software package for re-routing Win32 APIs underneath applications. For almost twenty years, has been licensed by hundreds of ISVs and used by nearly every product team at Microsoft.
首先要介绍该框架用到的几个概念：