Talk:Kernel

Hurd is mentioned as a kernel, and Mach as another one. But doesn't Hurd (the OS) use Mach (the kernel)?

Well, hurd is a kernel, mach is a microkernel. From the site:

The GNU Hurd is the GNU project's replacement for the Unix kernel. The Hurd is a collection of servers that run on the Mach microkernel to implement file systems, network protocols, file access control, and other features that are implemented by the Unix kernel or similar kernels (such as Linux).