configure computer for a certain pin?

There must be a way to set my computer to always expect a specific pin 
number so I don't have to type it on the computer to pair a device.  I 
am building a carpc and will be using a pan network through my cell 
phone for internet. This carpc will not have a keyboard to enter a pin 
in case I need to repair the device. I guess I could pair it when there 
IS a keyboard attached but I figure it would be more convenient to not 
have to.

Is there a way to just set up bluez to expect a certain pin number and 
to allow a pair if I enter that number on the other device?  The carpc 
has the gnome bluetooth applet running that takes care of pairing right 
now. Would I have to disable that?  I don't see any options in it to 
accomplish what I want.

Thanks for any help

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