Unlike most Unix-like kernels, the Hurd uses a server–client architecture, built on a microkernel that is responsible for providing the most basic kernel services – coordinating access to the hardware: the CPU (through process management and scheduling), RAM (via memory management), and other various input/output devices (via I/O scheduling) for sound, graphics, mass storage, etc. In theory, the microkernel design would allow for all device drivers to be built as servers working in user space, but today most drivers of this kind are still contained in the GNU Mach kernel space.