Application Resell

I would like to create an application that tracks lets say widgets, they can report on widgets, track widgets and do all kinds of things to widgets.

I would like to sell this "product"
A client buys it. I set up the account and when they login they login from my website. They use my product.. they like it. They tell a friend.
Friend buys my product. I set up their account. Which is the exact same code as their first friend.

Now I add extra functionality. I would like to make changes to how it works on a test area then push it to my two clients. My clients are always on the same platform. They do not need to know who zoho is. They just want to use my product. I just want to sell my product.

Can I do this in Zoho?