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GUI- (graphical user interface) an icon based link between a computer and its operator "Most users prefer an icon-based GUI over a command line option."

 VM- (virtual machine-  a software program which mimics the performance of one or more hardware devices in order to run software independently of the actual hardware "In order to run Java programs in Windows one needs to download an appropriate virtual machine."

X -(X Window System) a software toolkit for UNIX systems underlying numerous GUI window managers including KDE and Gnome "The man was surprised at how similar in functionality X was to Microsoft Windows."

OS- (operating system) a GUI or CLI software link between the computer and operator; also provides a framework for productivity software such as an office suite, web browser, or programming languages "The programmer tested his Java code on many operating systems including: Windows, Linux, and Macintosh."

Linux an open source version of Unix developed by a volunteer team of programmers around the world "Linux was originally developed by Linus Torvalds, who wanted a free Unix-like operating system that ran on standard PC hardware."

CLI (command line interface) a text-only link between a computer and its operator "The technician enjoyed administering the Unix server with the CLI tools."