.SKT file is Skleleton file. (but in source, noticed as .sklt)
the HUD option for horizon and vertical location.
(DOT, triangle, square, Rect, Quadda, Hexa.)
These props appear when you manipulate X or Y of the systemical GN3P.
and create your own display. I'll show you some of code from set kakes.
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[NOTE : AT BELOW THAN ROBO DEFINITION, THERE ARE Y AND Z
HAS BEEN REVERSED BY UNKNOWN REASON. KEEP YOURSELF]
(You will need some of tools to direct and regulate these sources.
which can be acquire at Netrob (of course alias). for any Netrob members.)