[ike84]

There are 2 basic security features built into our keys.

The first is a pill that when energized send a signal to the dme. This is what is responsible for disabling the immobilizer. It's the same technology in nearly every "key with a chip" (hint hint)

The second is the remote transmitter. It works similar to garage door openers, it communicated to the immobilizer through a set of rolling codes. In order for it to be programmed, you must (as jfp said) have the iPas code (comes with the key) and a piwis to enter that code into the dme system along with your immobilizer codes (which can be obtained by politely asking from most Porsche dealerships). You will occasionally see these keys with codes for sale on EBay. They're never cheap, but they're less expensive than what the dealer charges for them.

So, in short, you can buy a basic key (without buttons) and have the pill cut and programmed by anyone who has that ability - you can actually buy the programming hardware in Amazon - and it will work fine in your car. If you want the clickety click buttons though you only have one choice - legit key with code and piwis tool (unless you buy a basic key and then install a 433.9mhz receiver hardwired into the central locking circuit in the center dash, but that's a different discussion)

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