I always did feel that it was a Neural Net that literally made use of the human brain but it in a crude less refined way then a mind share that the Nomads benefit from. I believe we still require consoles in which to "port" ourselves to in order to utilize the Neural Net. The "port" action being a simple verbal command or a simple scan of a unique feature or something. It would probably be because of this console requirements and not instant access unlimited access (like a mind share) that we may still be able to withhold information from others able to use the Neural Net.