The manifestations of systemic lupus erythematosus as well include inflammation of the kidneys, loss of appetite, fatigue, and hair loss. Likewise, the origin of rheumatoid arthritis is still not known.The condition can attack the knees, wrists, feet, fingers, and ankles.he manifestations of systemic lupus erythematosus as well include inflammation of the kidneys, loss of appetite, fatigue, and hair loss. Likewise, the origin of rheumatoid arthritis is still not known.
Quick Answer. An operating system is the most essential program that allows a computer to run and execute programs. Without an operating system, a computer cannot be of any important use since the computer's hardware won't be able to communicate with the software. Continue Reading.
How to Check a PC Operating System. An operating system (OS) is software that manages the interaction between hardware resources and the programs or applications you use on a computer. Most PCs have a version of the Windows operating system on them but Macintosh, Linux and UNIX are other popular operating systems.