Methods of Logging In Remotely to Mountain Lion Server
You can log in to and manage Mountain Lion Server from another computer, including from Windows and Linux computers, in several ways. With all these methods, you do not need to install anything on OS X Server:
Secure Shell (SSH) command-line connection from any computer
The Server app from another Mac running OS X 10.8
Workgroup Manager from another Mac running OS X 10.8
Remote control with VNC-compatible software from any computer.
Remote control with Apple Remote Desktop from a Mac on the network.