🚀 go-pugleaf

I hate to ask this, because I'm sure it has been posted before, but I can't
find a good description anywhere:

Just exactly how does the system look at Fonts?  In other words, where and in
what resources are the font names and what restrictions apply to their
handling.  How does this apply to Fonts, FONDs, NFNTs, and postscript screen and
printer font versions.  I am asking this with respect to two specific problems.

In trying to create a new font by modifying and old one what do I have to do
to give it a valid ID number and name?

Second, for some reason a user here wants to change a Postscript font's name.
When he did with ResEdit two fonts showed up in his font menu, the old name
and the new one.  What's going on and what needs to be changed?

If there is a tech note that explains all this just give me a reference.

Thanks a lot...
Thomas Summerall