How to create a Boot Record that points to different disks

Is there a way to have the boot record on one drive also point to a second drive ?
For example, I want to have Windows 7 on physical drive #1 and Windows XP on physical drive #2.
I want the ability to boot to both without changing the BIOS boot order.

I think the old way was boot.ini where you could specify HDD 1, Partition 1 etc.