Thanee said:
You're right, it doesn't really mention skills. Only that the two forces magic and psionics are effective against each other.
So, going from there, UMD/UPD and Spellcraft/Psicraft would indeed only work on either magic or psionics, but spells and powers (esp. detect, dispel/negate) would work on both.
This is almost how it works in our game. Granted, most of these are the house rules of our DM:
1) The 0-level divination spell Detect Magic will also show current or lingering psionic affects. Likewise, the 1st-level psionic power Detect Psionics will show magical affects. When trying to discern the properties of a dissimilar affect the correlating spellcraft/psicraft DC increases by +5.
2) Dispel Magic and Dispel Psionics have the same relationship. The 3rd level spell Dispel Magic will also negate psionic affects and the 3rd level power Dispel Psionics will dispel magic affects. When attempting to dispel a dissimilar affect the correlating DC increases by +2 (DC becomes 13 + caster/manifester level).
3) Spell Resistance confers an equal Psionic Resistance and vice versa.
4) Use Magic Device & Use Psionic Device are the same skill.
5) Psicraft, Spellcraft, Knowledge (Arcana) & Knowledge (Psionics) are all different, individual skills.
6) Combat Casting and Combat Manifestation are the same feat.
7) Spell Penetration & Power Penetration are not the same feat, nor are their ‘Greater’ varieties (initially, these were the same in our game until I pointed out to him that they worked differently).
Take these for what they are worth. The rules really do not discuss feats or skills.