QNX is used as an operating system for embedded systems. For example a telephone switchboard or a telephone is controlled by an operating system. Normally you can program a microcontroller with assembly language to get it working. To get a microcontroller working properly without problems and failures as a fail-safe, redundant system QNX or other variants are used.

QNX features >> http://www.qnx.com/products/ps_neutrino/features.html