The primary computer (or server) is where your patient database will reside. This computer should be fairly fast and have sufficient memory. Preferably, this computer should be left on 24/7 and be subject to daily backups. See the system requirements in the User Manual.
You MUST install ezHealthWare software on this computer first. Otherwise you will have one (or more) computers with local databases. They will appear to open and run properly, but NO CHANGES will be recorded in the correct patient database.
You can always verify your database location using the ezPathUtility.