difference between event database and todo database?

[gracy]

What is the difference?
I can't found any difference.
Can I add the alarm to the todo list?

[traud]

Take your Nokia, go to its Organiser and have a look:
– Events are changed within the Calendar.
– To-dos are changed in the To-do list.
Is the vCalendar specification of any help?

An event is a calendaring and scheduling entity that represents a scheduled amount of time on a calendar. For example, it may be an activity; such as a one-hour, department meeting from 8 AM to 9 AM, tomorrow. A todo is a calendaring and scheduling entity that represents an action-item or assignment. For example, it may be an item of work assigned to an individual; such as "turn in travel expense today".

In the world of Nokia, a to-do might have an alarm warning about the due-date, yes.