Hi,

I would like to have 3 OS on the same Hard disk, viz., Win XP, FC 1 and FC 5 and would like to have something like GRUB boot loader helping me to select which OS to boot into.
How do I install the 3 OS so that GRUB can do what I want..

I have a dual boot system (Win XP and FC 1 prsently) on the same hard disk and would like to add FC 5.

I was saved the problem while configuring the dual-boot by the automatic partioning done while installing FC 1.
But with 3 OS I am not sure how to manually partition the disk to have what I want.

Fedora Core 5 will most probably detect win XP and Fedora Core 1 and configure grub for you.

Have a peek at the last link of my signature. It is good enough for multi booting 100+ systems. The second last Link is also relevant and has the explanation on how to do it (by chainloading).

Agrouf is also correct that the last install Linux can generally pick out all the installed systems to multi boot for you.