relevant (to me) dual boot info   (link)

http://www.computing.net/linux/wwwboard/forum/24704.html
installing windows on a separate, secondary hard drive and having grub trick it into booting anyway

title WinXP
map (hd0) (hd1)
map (hd1) (hd0)
rootnoverify (hd1,0)
chainloader +1
makeactive
boot