I often use SPY++ or SPY++ like tools to 'look into' controls of standard win32 program window, I can grab text from a SysListBox, TextBox, even a MSHTML control. Example, using spy4win
to grab the HTML in a Google Talk desktop client chat window, you can find GTalk actually implemented a internal Async Pluggable Protocol called "widget". When you open a transfered file, it invokes "widget:open", when you open the folder contains the file, it calls "widget:show". Very interesting hack.
But since more and more apps are written using webkit, wxWindows or XUL, is there any Spy++ tool for those?