Okay, there is some very good documentation about dual, triple,
quad etc booting over at
www.tldp.org.
Here is what I would do since you are at an early stage of installment.
1. WinXP is installed so leave it alone, if not then install it and move on.
2. Let's start with RH9, put in CD1 and choose new installation. Go through the steps to install and put the Grub bootloader onto the MBR (master
boot record). After RH9 is installed, reboot and make sure Grub is working properly before moving onto SuSE.
3. With WinXP and RH9 installed and working then put in CD1 of SuSE and reboot. When the installation starts tell it you want a "new installation", and go through the steps but don't make a separate /boot partition. Now when you get to the
boot loader part, tell it to put it onto your root partition. After installation make sure you write down the entry in /boot/grub/menu.lst file.
After SuSE is done installing, reboot and when Grub loads up you will see that you only have choices for WinXP and RH9, don't worry. Now
boot up RH9 and edit your menu.lst file in /boot/grub directory to add the info to
boot SuSE.
rberry88