Thank you telecino I was going to mention your books untill I saw your post. After 10 years of study (not practice) I have learned that the mudras are a universal subconcious code to adjust boilogical, neural, and energetic systems of the body many mystic societys have discovered some of them and use the ones they have an assoiate actualy uses them to redirect his inner energy in times of stress to keep from dieing and he discovered them on his own.
I'm here to learn/teach and as Soko Hatsumi says "play good"