QNX's microkernel

The QNX microkernel is responsible for the following:

• Interprocess communication. The Kernel supervises the routing of messages; it also manages two other forms of IPC: proxies and signals.
• Low-level network communication. The Kerneldelivers all messages destined for processes on the other nodes.
• Process scheduling. The Kernel's scheduler decides which process will execute next.
• First-level interrupt handling. All hardware interrupts and faults are first routed through the Kernel, then passed on to the appropriate driver or system manager.