Operating system
An operating system or OS was a collection of computer files that managed a computer's resources. 

At some point during the mid-23rd century, the  computer ran on version 36.11.4 of the OS. ()

In a recording altered by the T'Lani in 2370, Chief O'Brien was shown accidentally activating a radiation pulse which was part of a security program in the operating system of the T'Lani and Kellerun data banks. The pulse reportedly lead to his and Doctor Bashir's death, though the entire sequence of events was falsified. () 

In 2371, during their conversion of Deep Space 9's Ore Processing Unit Five into a deuterium refinery, O'Brien planned on showing Jake Sisko how to download the new operating system as soon as he finished deleting old Cardassian files. ()

Lt. Tuvok had difficulty decoding the operating system of the cryostasis chambers found on a class L planet in 2371. ()

In late 2373, Commander Worf ordered Cadet Nog to go to the  engine room and download the operating system into the computer core one file at a time after their attempts to increase the phaser relay efficiency did not work. ()

After the Attack on Mars in 2385, Starfleet Command determined that the A500 synth units were compromised due to a "fatal code error" in their operating system. ()

In 3189, after the Emerald Chain took over the , Commander Michael Burnham rebooted the ship's operating system to the system that the ship had before its futuristic upgrades, allowing her to regain control of the Discovery. Along with a change in operating system came a change in the computer voice from male to female. ()

See also 
Spacecraft Operating & Management System
Library Computer Access and Retrieval System
PCAP-SYS
TCARS

External link 
 

 Computer technology