Does the video adapter output both S-Video and Composite simultaneously?

I have a multi-zone receiver which converts S-Video to component for the main zone and passes S-Video signals through to zone 2 but does not convert them to composite which is how that zone is set up. I solved a similar problem with my DVD player by connecting both the component output and composite output of the DVD player to the receiver allowing high quality viewing in the lounge room and passable viewing in the bedroom.
I realise the quality from the adapter is questionable particularly for composite but I'm still interested if both S-Video and composite signals are output from the MBP 17" via the adapter simultanesouly.
Thanks,
Max.

I have a follow-up question which may help answer the original question. Does the MBP have to detect the external display when connected via S-Video/Composite in the same way that it has to when connected via DVI? My Dell notebook had so much trouble detecting composite and S-Video connections that eventually I gave up so I'm a little "once bitten twice shy" on this. If the MBP doesn't attempt to detect the external display via S-Video or composite then it must output both S-Video and Composite signals continuously (which would be great).
Thanks,
Max.

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