Heres a PDF Help doc for eCart 4
http://assets.webassist.com/pdf-help/ecart_help.pdf
and an online help doc for eCart 5:
http://www.webassist.com/help/eCart/
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.