How do i change the default OS which GRUB will load when I start up my machine if i don't press any keys? I am running a dual-boot with win2k and RH9 but might be adding another.

I believe this is as simple as editing your /boot/grub/grub.conf file and move what entry you want to boot up to the top of the list.

Putting it at the top of the /boot/grub/menu.lst will work if there is no default line (or if the default line is like this):

default=0

OR

you can set the default line to :

default=1

and boot from the 2nd entry...set default=2 to boot from the 3rd entry, etc...