If I set a task to be due 10-10-2012, will a reminder be sent?
If so, at what time will it be sent? Can this default reminder be changed?
if you set up a task without a particular due time (such as 10-10-2012 at 6pm), you will not receive a reminder for this task unless you set it up manually either by right-clicking on this task and choosing "Reminder" from the context menu or typing: <remind today at 6pm> within the task name.
If you do add a due time, an automatic reminder will be set to 30 minutes before the deadline, but only if there is a default reminder option specified in Preferences -> Reminders.
For tasks without specific due times, only absolute reminders can be set. For tasks with specific due times, you can also add relative reminders set to a certain time "before deadline".