如何从另一个应用程序捕获KeyDown ?
可以全局钩子到键盘:http://www.codeproject.com/KB/cs/globalhook.aspx
要知道一个击键来自一个特定的应用程序，你需要知道活动窗口是什么(即当前正在接收击键的窗口):http://www.csharphelp.com/2006/08/get-current-window-handle-and-caption-with-windows-api-in-c/
javascript python java c# php android html jquery c++ css ios sql mysql arrays asp.net json python-3.x ruby-on-rails .net sql-server django objective-c excel regex ruby linux ajax iphone xml vba spring asp.net-mvc database wordpress string postgresql wpf windows xcode bash git oracle list vb.net multithreading eclipse algorithm macos powershell visual-studio image forms numpy scala function api selenium