Jimmy, there is no useful documentation on this aspect of DFP, - and that includes the 'Help' file. This really should be addressed.
Thanks
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.