What is the main characteristic of a microcomputer system regarding windowing?

The main characteristic of a microcomputer system concerning windowing is its ability to allow multiple programs to be displayed simultaneously. This feature is a fundamental aspect of modern graphical user interfaces (GUIs), which are designed to enhance user experience by enabling multitasking. With windowing systems, users can open, view, and interact with several applications at once, facilitating better productivity and efficiency. This capability reflects the evolution in the design of microcomputers, leading to more versatile and user-friendly operating systems that support concurrent use of multiple applications.

Other options, like requiring extensive coding or being incompatible with most software, do not accurately represent the nature of microcomputer systems today. Modern microcomputers are designed to work with a wide range of compatible software and often provide user-friendly environments that minimize the need for complex coding. Additionally, the ability to run only one program at a time is characteristic of older or more simplistic systems, which is not the case for contemporary microcomputers that support advanced features like multitasking and windowing.