I've heard so many times about this so called "software list support" but how exactly do I use it? Everything I can find on Google gives you a vague understanding of what it is.
mame64 scv polepos2
that tells mame to launch with the 'scv' system and 'polepos2' from the software lists.
if you're not launching with the software lists it literally doesn't matter what's in the XML