Contents of a file in a particular folder and its sub-folders.
You know, when you are programming and using a large library and you want to find a particular constant or method or function but you only can guess at the spelling.
Like grep --
For example: I'm working with the OpenGL ES / JavaScript interface to Canvas3D. Lot's of JavaScript. No documentation. I needed to find a particular JavaScript function. I eventually found it using Vista's built in search but it's like the drunk test in the "Man With Two Brains"...