Whats the extra key hole behind the driver side door key hol

Whats the extra key hole behind the driver side door key hole on my 86 porsche 944 turbo for?

The alarm system.

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I really dint know of any extra keyhole on this model car. It seems to be aftermarket installation of an alarm system. some years back that was the way they were armed and disarmed. The key switch may be installed anywhere on the body. attempt tracing down the wires from behind the keyhole. If any. If you have a key for it then turn it on and attempt doing things that could set of an alarm. Bouncing or shaking the car or tapping on the glass with a coin. good luck

for you to wonder what it's there for