Questions about Massage

No really, I do have a couple of questions about legitimate massage. Nothing to do with the hobby, hence this location for my post.

I know that some of our ladies are RMT's and LMT's and this is directed at them.

(a) I know that there are LMT's and RMT's. One is licensed and one is registered. What is the difference in the training, e.g. is one merely registed with some state board whether they have had training? And does licensed refer to someone who has actually had formal training and passed some certification test?

Probably dumb questions, but I do want to know.

(b) I have some problems with pinched nerves in several areas. Are there any massage techniques that would relieve some of the problems that I have with these?

Just curious and looking for a little relief.