I am working on a project which should be launched on usertimed invervalls. Since this is no problem at all on the pc-side, I wonder how this is done on the mac os 9 and below side of computing.

Does anyone know? A small projector should be launched when the user wants it to be. The user has a possibility to choose the next launch via a preference menu and this (launch-)time will be written to a text(preference-)file.

The app-launch-times should be weeks/months intervall...
How can I bring the mac to read this pref-file and open my app?

thanks for any hint
fred