D&D 3E/3.5 - Natural 20 Question (3.5)

Hey guys,
Got another question for y'all. My group and I have been having a discussion on WHAT rolls a natural 20 auto-succeeds and a 1 auto fails on , and what rolls they don't.

Correct me if I'm wrong, but it seems ONLY attack rolls, crit. conf. rolls, and saving throws are auto win on 20's and auto fails on 1's.

While every other d20 is determined by the dice: initiative, grapplechecks, disarms, sunders, dispels, spell penetrations, etc...

Thanks guys,

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