Gaining access to computing services in a local network is not quite as transparent as accessing files. Ideally if you had an X terminal in your office you could go through the login process (type your name and password) and the terminal would connect you to a free or lightly used system. Most of the time, however, you have to identify the system you want to use by name. The same is true if you have a workstation in your office and want to use another system on the network. For example, suppose your department has licenses to run Mathematica on HP workstations, but the machine in your office is a Sun workstation. To run Mathematica you would log in to one of the HPs, specifying which system you want to use by its name, and then start Mathematica on that machine.
The program you run to log in to another computer is rlogin (remote login). To log in to another system, simply type rlogin and the name of the system:
% rlogin fogrlogin also works for nonlocal systems, but in this case you need a more complex identifier for the other system. For example, if your workstation is in the Physics department and you want to use a machine in the Computer Science department, you might type
% rlogin fog.csor perhaps
% rlogin fog.cs.cascadia.edu