An operating system that is designed to work in a computer that processes 64 bits at a time. Most personal computers today are 64-bit, and mobile devices are expected to begin using 64-bit CPUs in the ...

The first OS installed in a computer. In a virtual machine environment, there may be a host operating system that interacts with the virtual machine monitor, which manages the virtual machines.

How many times have you been asked what operating system version you use, and you haven’t got a clue? The question is often asked when you’re seeking technical support for software or hardware issues, ...