I think I understood you correctly;
I just did a test, whereby I booted into windows, then hibernated it. I then turned the machine back on, and left it, and it booted into OS X. Fine.
Then I restarted again, preparing to boot into Windows as I normally would. The de-hibernation status thingy came up, and in next to no time I was back into Windows.
I had never thought of this before, and it certianly saves a lot of time when booting/rebooting. Its a shame theres no way to 'tell' OS X to hibernate - I know theres the safe sleep feature, but that solution wouldn't work, as it only functions when power is lost during sleep.