Architecture of Windows and Linux
Windows 2000 Architecture:
Windows 2000 consists of two major parts, the operating system itself, which runs in kernel mode, and the environment subsystem which runs in user mode. The kernel handles the process management, memory management, file systems and so on.
Linus Torvalds first developed LINUX as a small but self-contained kernel in 1991, with the major design goal of UNIX compatibility. LINUX is a modern open-source operating system based on UNIX standards. It has been designed to run efficiently and reliably on common PC hardware, but also runs on a variety of other platforms.