about LoadLevelTarget and LoadlevelStatus

Hi,

Could anybody let me know please where the variables LoadLevelTarget and LoadlevelStatus respectively are physically stored ? On the box or the device itself ?
I guess LoadLevelTarget is actually a box variable since it is simultaneously updated at each dimming change request but what about LoadlevelStatus ? Is this data actually stored physically in the device itself as I can guess ? Or maybe it is not that simple. Maybe it is only a simple and local LoadLevelTarget duplication after recieving zwave acknowledge message ?!

I don’t really know how all that stuff exactly works at the lowest zwave level but I need more information about it and as precise as possible please.

That’s important to me for both lua/luup code optimization and in order to test a new device of mine (dimmer socket Philio Pad) which does sadly not seem to work always properly.