Shouldn't be too hard, other programs have done it.
I had Desktop Wizard for years before I got Hal.
You can tell her to remind you of the time.
On my old version I had 3 choices, every 15 min, 30 min, or hourly.
I just took a look at it and the acs people.
humm.... there's Candi, Crystal, Cynthea, Dawn, Pandora, Melissa, and there's "Sara Jane Fun".
("Don't tell Sandee")