You only need pulp installed in the same machine you have the itunes app whose songs you wish to access through the net, in your case the G5. Let's start by verifying pulp is running correctly there. After you start pulp, click on the orange icon in the tray, and select the "test locally" menu item. Safari should open automatically, showing the pulptunes interface with your music library. Let me know if you can get this far to continue with the following steps.