It is used when you want to integrate PowerGallery with HTMLeditor or PowerStore or PowerCMS - See this post showthread.php?t=7757
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.