If you ever wondered if it is possible to develop WPF applications online, then the answer is yes. I recently stumbled upon a tool, called CodeRun. It is an online IDE that allows the developer to create various types of applications online, directly from the web browser, without the need to install any additional plug-ins or applications. One of the features of this tool is the possibility to create Windows Presentation Foundation applications. To be specific, it allows the developer to work on WPF Browser Applications (since it would not be possible at this time to run a client application).