In R12, they have got ridden of all external scripts., and our very old script, root.sh is no more used.

And hence we don't have neither oratab nor Global inventory.
(I am not sure if the same thing holds good for 10.2.0 standalone database installation.)

In this context, how do we automate startup's/shutdowns, and also how does oracle tracks multiple installations(oracle_homes) on the same machine.