Domain/OS

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Domain/OS
Domain/OS 10.4, showing a Display Manager (DM) session
Developer	Apollo Computer, Hewlett-Packard
Written in	Pascal
OS family	Multics-like and Unix-like
Working state	Historic
Initial release	March 27, 1981; 44 years ago (1981-03-27) (Aegis SR1)
Latest release	Domain/OS SR10.4.1.2 / March 1992 (for SR10.4)[1]
Available in	English
Platforms	Apollo/Domain workstations
Kernel type	AEGIS: Monolithic Domain/OS: Microkernel
Userland	AEGIS, BSD, System V
Default user interface	DM windowing system, CLI

Domain/OS was a distributed, multiuser operating system developed by Apollo Computer and later maintained by Hewlett-Packard after Apollo's acquisition in 1989. Initially introduced as AEGIS in 1981, it pioneered the concept of network-centric computing, where every machine was integrated into a unified network file and user system. In 1988, Apollo added compatibility layers for System V and BSD Unix, renaming the system to Domain/OS.

Hewlett-Packard supported the operating system for a short time but later discontinued it in favor of HP-UX. Final official support for Domain/OS ended on January 1, 2001.^[2]