[jitter] 2 render contexts, 1 window?

Not two contexts, but two viewports in one window, yes. You can use  
sketch and gluperspective, and glviewport to do this.

glmatrixmode projection, glloadidentity, gluperspective whatever  
whatever., glviewport whatver whatever,  then render your shiz.

etc etc.

search the list , I think I posted a patch with it working.

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