"C:\Program Files (x86)\Microsoft Help Viewer\v2.2\HlpViewer.exe" /catalogName VisualStudio14
"C:\Program Files (x86)\Microsoft Help Viewer\v2.1\HlpViewer.exe" /catalogName VisualStudio12
直接启动MSDN帮助文档，不启动Visual Studio
原文：http://www.cnblogs.com/iwasmu/p/4933416.html
