RainHeart pretty much summed up PackLocation and PackSize. (On a side note, thanks for that image. Was that in the doc file? Wordpad didn't show that.)
PackLocationProp and PackSizeProp don't do anything, they're simply there for reference (helps making sure things are just up against the right edge, for example) and alter themselves if you move things around.
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If it ain't broke, it needs more features!
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