I have the Dell Diagnostic CD and WinPe running on my drive.
Dell diagnostics (use the iso)
title Dell Diagnostics
find --set-root /delldiags.iso
map --mem /delldiags.iso (hd32)
map --hook
root (hd32)
chainloader (hd32)
And Winpe (extracted to the root of the drive)
title WinPE
chainloader /boot/bootmgr
Grub2
It may run differentially for someone else, I made my multiboot with this which recently popped up on Lifehacker.