Just delete the database. Afterwards, close FileZ and relaunch your database program--everything
should be blank. Now just make sure when you hotsync that you set your datebook synchronization to
'desktop overwrites handheld', at least once. Afterwards, just set it up to so they synchronize. If
you want everything blank, both on the handheld and desktop, then setup your datebook syncronization
to 'handheld overwrites desktop' (CAUTION: This will remove all datebook entries from both
locations, the Palm and desktop software.)
As for the contacts, I suggest using Undupe; however, there is an AddressDB on the Palm you could
delete. Although, there are several other related databases, such as AddressCity, AddressState, etc.
you may wish the delete as well. That's why I suggest you try Undupe first.