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shell
The user interface is software.
what type of program is used to provides the graphical user interface
Call tracking system.
Operating systems software manages the hardware on your computer, and provides an interface between the user- or application software, and the computer hardware.
Operating System software. Like Windows or OSX.
user interface
Application programming interface software
User interface
An Operating System is an organized system of software components that coordinates the use of hardware and time resources for user application software. Typically it provides a standardized abstraction of the hardware resources so that the user application software runs the same even when the actual physical hardware varies on different computers. Typically it provides a standardized user interface so that the user can learn how to control different user application software programs faster.
WEKA software provides the user with interface for learning how to use software called "Java". WEKA performs services such as performing real world data mining using algorithms.
I believe you are referring to the shell program, which is that interface. There are many different shell environments available to the user, depending on what they intend to do in the login area. Some shells are more for software developers, some are for users, etc.