Change root

i am having 4 operting system
RHEL4
RHEL5
SLES9
SLES10

when the system boots up i need to have rhel4 so how to change the mount point and after that how can change the root to diff OS'

somebody help me

thanks
revenna

look at /boot/grub/grub.conf and you can set the OS you want to be the default. Remember, it starts counting at 0 and not 1

its the best way to change....