I have a single domain with 7 separate installs of Zen Cart. (Need 7 different ones to keep vendors separate & the sites HAVE to look completely different). We are currently doing offline credit card processing at the moment until some funds are generated. Everything works flawlessly but what I need to happen is when someone creates an account on one store, I need it to be created on ALL the other stores. It would also be nice to share the cart between all the stores if possible. I have read over the Multi-Shop module and I am afraid to try it because it appears it was designed for several different domains and i am only using one domain. i am also a little confused on if I have to install this module on every store. Any help would be appreciated. Thanks in advance.