I think you hit it on the head. Hot swap is also for components that could be changed/installed on the fly. With plug and play, there devices have a physical unique identifier (a chip) that contains the info needed to be recognized and correctly installed. Plug n'play has been around long before XP. As far as onboard vid, most MBD should recognize when you have a new vid card in and disable it themselves, so you dont want to disable it, but as wolf said you may want to unistall the associated files with it. Guess you could do it the old fashioned way (I still do it this way, because it makes installation easier as far as no problems trying to install new drivers). Thats by going into display properties, settings, advanced, adapter and change the adapter that is currently listed. You will want to change it to 'standard PCI graphics adapter VGA' and YES I'm sure your thinking "but I have AGP..." it doesn't matter. when you change it, shutdown and install the card and boot up and install the drivers.
If you argue with an idiot he will drag you down to his level and beat you with experience.
I am not a fast writer.
I am not a slow writer.
I am a half-fast writer.