Some will setup such a system and after working very hard on the XP OS decide to dump the Windows ME partition and just run XP as the boot OS.

This is when some scream in agony that no supported method exists to "move" that tuned XP setup to the boot position.

Just so you are aware.

In closing, I know of no BIOS that will support "a second bootable partition", but most will allow selection of a drive or device. The boot manager is still in the MBR.

Bob