The pco.sdk is a software development kit for Windows OS. It enables you to control PCO cameras in your own software.
The pco.recorder is a software development kit for Windows OS based on the pco.sdk. It remarkably simplifies your image acquisition, storage and processing for PCO cameras.
With pco.linux API you have a free implementation for the pco.camera series on hand. Using this interface, you are able to write your own applications in a Linux environment.