Gl multiple render targets and/or geometry shader feedback loops

Hello. Has anyone been able to get geometry shader GPU-only feedback loops in Max 6? Meaning, the ability to generate data in a geometry shader and then use that same data on the next render pass *and* that data stays on the GPU…its isn’t passed back to the CPU.

This might be related to multiple render targets. I’m now to this place in the rabbit hole…and particle systems.