Inks are loaded X,K,C,M,Y,X, and the X's are interchangeable (At least Gold, White, Silver are) as an Overlay or Underlay. Clear can only be loaded as an Overlay(last slot in the path).
This pdf has some prints with examples, and admittedly, the examples at first appear to be backwards, because we all read top to bottom, but when you look at the CMYK order, it is clear it should be read bottom to top.(page 2)
From the left to the right developer module are dispose in order: overlay (clear, gold, silver), yellow, magenta, cyan, black, underlay (gold, silver). This is what I know.