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Point Clouds architecture in VEX is based on data structure called kd-trees. They are created in memory from Houdini geometry and kept in cache for a period of VEX execution. Handle is like a reference of this structure inside a single VEX instance (like VOPSOP, or VEXSOP or any vex involved operator). If you create two point clouds inside single VOPSOP, they will probably have handles 0 and 1. Go figure! It's basically an integer which lets you tell to other pc* functions which point cloud you're interested in (among many possibly created).

Yeah, much more visually interesting than the ICE videos, Awesome!

Sure sop_paint_to_cops_and_back.hipnc

i don't know what import node in COPs you have in mind but it's pretty straightforward in VOP COP2 Generator example file included sop_paint_to_cops.hipnc