I found this in the Win2k FAQ, but a friend that I'm helping has a slightly different setup:

How can I add Linux to the Windows 2000 boot menu?
In the shell enter "lilo -s /tmp/linux.bin" without the quotes and hit return. Then copy linux.bin from /tmp to your Windows boot harddisk.

Open boot.ini and add the follow:
C:linux.bin="Linux"

Example:
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(1)partition(1)WINNT [operating systems]
multi(0)disk(0)rdisk(1)partition(1)WINNT="Microsoft Windows 2000 Professional" /fastdetect
C:linux.bin="Linux"
C:="Microsoft Windows Millennium"

This boot.ini boots Windows Millennium and Linux from the first harddisk and Windows 2000 Professional from the second
>>>>>>>>>>>>>>>>>>>>

My friend has Win2k Prof on the 1st physical HD and Redhat on the 2nd physical disk. What should I change in the above example to get Linux to be added to her boot menu? Any help is GREATLY appreciated, thanks.

Why don't you install either Lilo or Grub? Either of those would work easier than the MS Bootloader.

Well, I followed the instructions for installing LILO to boot both OSes during RedHat 8.0 setup, which, by the onscreen instructions, sounded like it would work (it didn't, it goes straight into Win2k). The RH install instructions are quite explicit, too, at getting a dual-boot to work. I installed Win2k first, then RH. I admit to being a relative Linux newbie, though I've installed it on standalone systems several times.

The only thing your friend has to add (to his "boot.ini", not to example) is
C:\linux.bin="Linux". Oh.. and don't forget to copy "linux.bin" to C:\ .

One other thing, instead of "lilo -s /tmp/linux.bin" you could also try
"dd if=/dev/hda5 bs=512 count=1 of=/tmp/linux.bin" where "hda5" is a linux boot drive (check out line that says "boot" in "lilo.conf").