It's all the same: a bootloader and how it's configured. First of all there needs to be at least two operating systems installed (or kernel versions) so that it would make sense having a boot menu. Linux users usually use GRUB or LiLo bootloaders, but there are a lot of alternatives; even Windows' bootloader can boot Linuxes, and other operating systems (not sure about Vista, but I guess it makes no difference), but it's typically a bit more difficult than just installing GRUB or some other bootloader along with Linux (or, if you have another OS, then it's bootloader or some 3rd party loader). Basically to get a non-Windows operating system to be present in the Windows Boot Menu (that you get by pressing usually F8 before Windows boots if it's installed as the main OS) is to create a disk image of the other OS's boot partition, copy it to your Windows partition where W can access it, and then add an entry to your boot.ini file. I believe somebody has written good instructions on how this is done, so look from Google.
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