it really depends on what level of complexity you need.

there are several ways to do this sort of thing.

If you could be more specific about what you need to be able to do then we can help you further.

do you just need catalyst to launch when the mac is booted, run a sequence and shut itself down at night?

or does it need to be more complex, run certain sequences at certain times, or on certain days?

How is your system set up? do you need it to turn projectors or displays on/off as well? is catalyst responding to external commands or running its own internal cue list?

The way you set this type of thing up depends upon your requirements.

Paul