Unified method of get and set sub-object selection for Editable Poly and Edit Poly.

I accidentally found a unified method of getting and setting sub-object selection for an Editable Poly objects and Edit Poly modifier. The main problem is that the object must be selected.
I found it in PolyTools.ms script(maxRoot\stdplugs\stdscripts\PolyTools.ms), so only 3dsmax 2010 and above can use it.
I am pretty sure that this comes in 3dsmax with PolyBoost integration.

(
    --    get vertex selection as bitarray
    PolyBGetSel 1
    --    get edge/border selection as bitarray
    PolyBGetSel 2
    --    get face/element selection as bitarray
    PolyBGetSel 3
    
    --    set vertex selection
    PolyBSetSel 1 #{1..20}
    --    set vertex selection
    PolyBSetSel 2 #{1..20}
    --    set vertex selection
    PolyBSetSel 3 #{1..20}
)