Yes, that's the idea of this module. But you will no longer need multiple installations, just one zencart, one admin... And you can make it completely different - use different templates, have different categories, use different modules etc. For a frontend user, these will be completely different sites, BUT once a user creates account on one site, that account exists on all other sites. So, if register at site1, you can use your login and pass at site2 and you will have your order history from both site1 and site2. Depending on what you want to achieve, this can be an advantage or a disadvantage. But, as I've already said, I believe your customers MUST know that they are dealing with the same person/company, only different sites.