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.

I've used nearly every possible desktop operating system known. I've experienced nearly every incarnation of Windows and MacOS, I've used just about all the various Linux distributions over the years, ...