Hallo, world!

The M-x man command does 2 things:
(i) It finds the pertinent file using complicated, difficult, and
obscure algorithms;
(ii) It converts the markup stuff in the file to a readable form and
displays it.

I have an Nroff file, mount.8, loaded into Emacs. How do I do part
(ii) of the above, and get it nicely displayed?

TIA!