Nuke had a Bluefish plug in in the past but it never actually worked. So for now you can't do that in Nuke with any I/O board in any OS, unless your board has something that captures an area of your monitor output and outputs that's to a external monitor instead (ala the old MEDIA 100). I think nVidia Quadro's FX SDI models have a similar app that could handle something like that, even tho is something that I personally haven't tested and it's probably not the best or perfect solution.
For now I would say that if you really need to rely on a frame buffer go with Fusion instead.
Unless someone else knows of a better solution.
But as far as I know The Foundry does have plans to implement frame buffer support in Nuke in future releases, so if time isn't a issue... wait, Nuke does worth it ![]()
Cheers,
diogo