emacs settings priority

[crstml]

Hello all

I have some issues when I want to set the fonts in emacs and I
think that they are related to the priority of the various means
(X resource, command line, init file) used for that.

I've tried without success to find in the manual information
about these priorities/precedences.

Is it possible to know how emacs decides what font is used when the
same font is specified in more places: X resource, command line,
init file?

But the question can also be generalized to other properties not
only for fonts.

Thank you in advance
Cristian