Most of the time I don't need to think about it, but once in a while it comes up.
An array of window IDs ordered by stacking level (z-index).
windowOrder
windowIdsOrder
orderedWindowIds
stackOrderedWindowIds
windowIdsByStackOrder
There's a point where the variable name becomes a bit long. But just "ordered".. ordered by what? windowOrder is short, but what's in the array?