Totally ignorant (almost)

Ciao todos, I'm a newbee, I have some doubts and am very curious, what's the:

- loader

- MR

- SW (I can immagine)

I have an MR with, Loader 1.0 & FW 1.081, I manually update through remote when necessary.

If I upgrade to, lets say, to MR 1.13 will I see more than just T*S, P*lsat etc.?

I've surfed a lot, I do find watever file, but, I can' understand what they are used for.

I'm not totally stupid, if someone could please explain in simple words how and what for they work.

Thanks in advance buddies.