This is what it says about it on the Yotsuba page
"A Yotsuba secret technique to transform information into psion signals and transfer that information through the nervous system and into another person's subconscious Magic Calculation Area."
Does anyone think this means that a Member of the Yotsuba could use he MCA of another person, if they cannot, at least could Tatsuya use Miyuki's MCA to cast powerful magic that he could not do with his weak artificial MCA? If so, they would probably have to make skin contact to do it.
Any other thoughts on Psion Transfer?