There are approximately 3.1 million active registered nurses in the United States. There, a registered nurse is a clinician who has completed at least an associate degree in nursing or a hospital-based diploma program.
An operating system normally also provides the default user interface for the system. The standard look of Windows 98 includes the Start button, the task bar, etc. The Mac OS provides a completely different look and feel for Macintosh computers. Linux is as much a phenomenon as it is an operating system. To understand why Linux has become so popular, it is helpful to know a little bit about its history. The first version of UNIX was originally developed several decades ago and was used primarily as a research operating system in universities.
Quick Answer. Utility software is used to perform basic maintenance tasks on a computer. Examples include disk utilities like defragmenters, compressors and cleaners. There are also operating system utilities such as antivirus programs, registry cleaners and system restoration programs.