We should probably have an Ask A Question forum, but anyway. If you're a multiclass psionic character, you explicitly have a common pool of power points. However, on the subject of learning powers from classes with separate lists, the SRD has this to say:
While you maintain a single reserve of power points from your class, race, and feat selections, you are still limited by the manifester level you have achieved with each power you know.
Let's say I'm, for example, a Wilder 2/Egoist 1 with an 18 Cha and 14 Int. My powers known are Astral Traveler (wilder), Attraction (wilder), Bolt (psion), Psionic Daze (psion), and Thicken Skin (psion). I'm limited to ML 1 with the 3 powers I learned as a psion, correct? Can I manifest Psionic Daze as a wilder (still at ML 1) to use my Cha bonus for the DC, or am I stuck with the Int bonus since I learned it as a Psion? (I'm guessing the latter, but I wanted more opinions.)