How do I bake an action?

Um… I’ve searched around ending up with the following quote which repeatedly popped up:

“If you have an animation that involves constraints and you would like to use it in the game engine (which does not evaluate constraints, and is not covered in this Book), you can bake the Action by pressing the BAKE button in the Action Window ToolBar. This will create a new Action in which every frame is a KeyFrame. This Action can be played in the game engine and should display correctly with all constraints removed. For best results, make sure that all constraint targets are located within the same armature.”

Now, in Unity 2.49 the “BAKE” button is nowhere to be found in the action window! (?)

Where is it now?