Okay, so it might be possible, but why on earth would you want that? I mean : if it''s so easy to distribute jobs on a per-frame basis, why then bother to do it this way?

Actually this is a very requested feature.
If you need to tweak materials or the lights in a scene, you do a lot of test-renders. So if you wait 20 seconds instead of 3 minutes, it saves you a lot (!) of time during the day.

And actually some render-engines already support this feature, like
final render and vray. 3ds max''s scanline render can fake it also through a script which is no more freely availible but which is included in the design extension for subscribers. Well ... i forgot, there''s a new script out there doing it now, too. )
Of course, all this is non-realtime

OpenRT is a project trying to get real-time raytracing through ... ehr grid-computing? Network computing.
I''ve seen a life demo with 5 dual computers. Nice!

So there are many reason on earth for wanting this! ;P

Nice information