How do you use the new bullet constraints

This is a great new feature, but I can’t find any tuts, etc. on how to use it. Can anyone help?

this does not belong to the Blender engine resource section! it goes to Game Engine Support and Discussion section!

I’d be really interested to learn how to do that myself…

They are used here in the physics demo at…php?f=11&t=752
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gears, rag dolls etc