hi guys, as u all know, there are tons of tutorials to create bootable *single* OS installation from USB thumbdrive. i am wondering, is there any solutions to create a "multi-OS" bootable installation from USB thumbdrive? that means, in a 16GB USB thumb drive, there are 3 separate OS setup locations (maybe separated by 3 diferent folders). when boot into the USB thumb drive, I'll be able to select (auto or manual; doesnt matter) which OS to setup. e.g. I setup XP SP2 first, then setup Vista SP2, and finally Windows 7 (all sources from the USB thumbdrive. Reason is that i wanted to create multi-OS setup on machines, and creating a multi-OS installer in USB thumb drive is more logical (but technically difficult). any help is appreciated! Thanks!