I'm might buy a 2009 Accord LX-P and talking to dealer today one salesperson said that it is only the special (expensive) key that disables the car but no alarm. She left early and I them asked another salesperson. He said the car will sound alarm if someone breaks a window etc..
I have googled and looked all over Honda site but all I see is Security System or Immobilizer Theft-Deterrent System but no details. It has the panic alarm so I would think there is an alarm if someone breaks in?

 

Leave a window rolled down, then lock the car using the key remote. Put the key somewhere else in the room & reach in thru the window to open the door. Does the alarm go off???

 

I'm not sure if that is a yes or no.
As mentioned I did not buy the car yet so I cannot do this test until I go back to dealer.

 

It's a "I don't know but here's how you can check for yourself". In other words, it's a NON-answer. Sorry.