Key Replacements

Hello Group;
I was reading in the manual for the 2006 PT Cruiser that to program a new car key you must have two existing working keys. They go on to say you need to insert key one into the ingition, wait a number of seconds, withdraw it, then insert key two and do the same. Then insert the new key to program it.
I only have one key, why can't i just insert the same key twice and then the new blank key? Has anyone tried this?
Thank you

It needs to be programed with the DRB III done by the dealer.Most Chrysler keys are this way including the ones with key fobs built into the key.