How to get a jit.gl.render to draw to a floating window and a pwindow same time?

gpvillamil's icon

I've got a patch running that uses jit.gl.render to draw to a floating window. Works fine, but I would like to have a jit.pwindow set up as a "preview monitor" that copies everything that goes to the floating window.

How do I do this? @capture in the jit.gl.render object, and then another jit.gl.render?