event handling - shutdown, reboot, hibernate notification in leopard using python -

I am developing an application using Python for which the system is notified of shutdown, reboots, hibernation etc. should be done. Do i do this

Please put some light on this object or an indication in applescript would be good enough.

Thanks in advance

OK, you use the script to hook Can be able to shut down shutdown, reboot, etc. Do not forget, check out.