I have see this in an ubuntu /boot/grub/grub.cfg, for booting windows:

menuentry "Windows Vista (loader) (on /dev/sda2)" {
      insmod ntfs
      set root='(hd0,2)'
      search --no-floppy --fs-uuid --set 04ace963ace9502a
      chainloader +1
}
Note: 
  /dev/sda partitions:
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1          11       88326   de  Dell Utility
/dev/sda2   *          12        9727    78035753+   7  HPFS/NTFS
/dev/sda3            9727       19453    78124033    5  Extended
/dev/sda5            9727       19051    74896384   83  Linux
/dev/sda6           19051       19453     3226624   82  Linux swap / Solaris