server monitor

When I buy a server, you need a monitor? How can we "see" what I put on the server?
I will install software on a server, an online store, but I've never seen advertising monitors to go with the servers. How can I see the interface graphical user changes I do.
Initially, you need a monitor when you install your server software, then you can use any workstation (connected to the server, of course) to see or use your server. You can do this using "Remote Desktop Connection. However, if you use the server as a workstation (not recommended), you certainly need a monitor to use the server as a workstation. Otherwise, you can operate the server from any remote workstation.