bho测试的例子，初学者学习很好的一个例子,bho test examples for beginners learning a good example

介绍一下如何开发BHO插件，开发环境为VC6.0（使用ATL），安装Platform SDK中的Internet Development SDK。-Tell us how to develop BHO plug-in development environment for VC6.0 (using ATL), install the Platform SDK in the Internet Development SDK.