Car Alarms: 2000 Honda Accord, alarmtek, dash area

Question
The sequence of events are as follows, my wife parked the car, took the keys out of the ignition, opened the door and hit the lock button, turned to get something out of the passenger seat and the wind blew the door shut, she then hit the button(on the door) to unlock the door and the alarm(factory) started going off, she put the key in the ignition and started the car, she drove off and the alarm when off for the next mile or two.

Answer
Please be more descriptive if possible.

"GOING OFF?"

I need to determine whether it's a factory alarm
issue or, if it's an aftermarket system you are
dealing with.

Is it: Headlights flashing, car horn honking
and a worded SECURITY" light in the dash flashing?
(doubtfull since none of the notes show this
car as having a factory alarm system)=FACTORY

Or,

is it: flashing parking lights,
an LED in the dash area, and a siren
going off?= AFTER MARKET

Let me know more on this to better
advise you on a course of action
to take.

Best Regards,

Robert Martin
CEO/ALARMTEK
CARALARMMAN.com