You do need Pro Pack or Poser 5 to take advantage of it. The Poser 4 Pro Pack book by Richard Schrand has a little bit of info about the use of Python using Pro Pack. For the most part these scripts will help you automate some of your task. In addition some of them might clean up some of the extra scripts from the program or from characters to help the program run faster. If you are not a programmer,,,, Use with caution, and make sure you back up your Runtime before any attempt at using them.