How do the users communicate with the SAP instance?

Well, of course, you need to add them to the SAP instance. Then the user has to be able to connect to the application layer in some from. Normally this is using the SAP supplied program SAPGui which is installed on a user’s workstation, but here are other ways such as connecting to a Citrix server on which SAP is installed or connecting from the internet using a SAP product via Portals, ITS, or some other product, or using one of the SAGUi alternatives like SAPGui for Java.

SAP uses some common ports no matter where it has been installed. The first instance installed on a server is labeled as System Number 00. It would use ports 3600 for the Dispatcher, 3300 for the Gateway, and 3600 for the Message Server. If you had a second SAP instance installed on the same SAP server, it would normally use the next available number in the port range. So SAP instance #2 would be System Number 01, use port 3601 for the Dispatcher, 3301 for the Gateway, and 3601 for the Message Server. As long as a user can access these ports from his workstation, he can log on via the SAPGui installed on his workstation.

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