BleepingComputer.com: How can I boot from multiple hard drives and operating systems

At work I am running xp home but I have another harddrive in the bow which has Win 2k pro with a program on it I use weekly. How can I set the machine up so I can boot from either drive. I have tried everything I can think of but can't figure this out. I placed the drives in cable select mode but only the xp drive shows up in bios setup. When the box boots up I can see the win 200 drive but can't open the program from the xp drive. This program will not work in xp. Long story short is the boss is cheaping out and will not upgrade the program

http://neosmart.net/dl.php?id=1

Should do it. I don't use it but it looks like it should be simpler and more windows centric than what I use.

There are other boot managers. I use grub to boot Linux and three different versions of windows on the same machine. Grub is a bit complex but is integrated into multiboots that include linux