somewhere a while ago, i read that i can use zoho on-site, in a server inside my company.

Is that possible?

If its not possible, can I change the menu on the application, so for the user think that some page is a zoho functionality?

For example, my client uses i service order template that i developed, if i dont want to change this template, can i publish in a server and create a menu item in zoho crm?

Thanks