NOTE:
ID is a very long number (UUID) that you get after using the first command.
The file "bootsect.lnx" can have any name providing that it contains a copy of the Linux partition boot sector (that loads GRUB).
You should be able to use "/addfirst" instead of "/addlast" if you want Linux to appear in the boot menu before Vista.
 
If you're familiar with creating a bootsector file to add Linux into the Windows XP boot menu, you create the "bootsect.lnx" file for Vista in exactly the same way. Use a "dd" command similar to this in Linux.