Car Alarms: Where did the car alarm come from?, valet mode, dash area

Question
I bought a 1995 Ford F150 a few months ago.  I have been driving it around for the last few months and the other day I opened my car with the key and an alarm went off.  It goes off the moment I open up the door.  I also can not start the car.  I did not know there was an alarm on the car.  I can not find the kill switch and the truck is stuck behind my garage.  I tried to undo the battery hoping it would reset but no luck.  

Does anyone have any suggestions?  I am out of ideas.  I can't move the car to take it anywhere either.  Please help?

Answer
Ok, should be fairly easy. To try to disarm it,
look under the dash area for a button or,
a toggle switch. When you locate it, turn on the
ignition key, press and hold in the button (little
spring loaded micro button, red or black possibly)
until the alarm chirps 1 time. This should over ride
the system, and only the keyless entry part,
if installed, would still be operating.
The LED (light emiting diode) light in the dash
should also go on solid.=VALET/OVERIDE

This stops the alarm except for the keyless
entry if installed. Once in Valet mode,
it will allow the car to start and operate
like there was no alarm at all.

That should solve the troubles for now.
Repeat the steps to toggle back to valet when needed.

Let me know what you discover.

ALARMTEK
WWW.CARALARMMAN.COM