FyreSpiryt mentions dual parenting, and using version numbers to control forward and backward compatibility. Both excellent ideas. Before I ever heard of Poser, I built a primitive little animation app, which included dual (stretch-between) parenting. With no previous knowledge of any animation program, I could see the need for this, and it was easy to program. "Pick-up and put-down" parenting is also easy. When I started using Poser, I was puzzled and disappointed that it had neither of those features, which are so obviously critical for animating ordinary actions, and so easy to accomplish. Is there a "competing app" that does have more flexible parenting?

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