Prototype is a JavaScript framework that aims to ease development of dynamic web applications.
It defines both generally useful functions for Javascript development, as well as some pieces for doing actual AJAX interactions.
See http://www.sergiopereira.com/articles/prototype.js.html for some good documentation.

Heck, if it’s 2011 BMW, we probably won’t see it for couple years but here’s some spy shots of the prototype.
TheCarConnection.com’s spy photographer ring has nabbed these new photos of the next BMW 5-Series, including the first interior photos. The cabin shot shows a relocated iDrive controller with satellite buttons, which may provide shortcuts like the buttons that surround Audi’s MMI controller. A joystick-style shifter is also found inside, as is a button for an electronic parking brake.
via autoblog - thecarconnection
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