0 rules about actions and activities that people should or should not perform or take part in: --
The teacher spent ten minutes explaining all the dos and don'ts in the classroom..
1 abbreviation for denial of service: an occasion when a computer network or website is intentionally prevented from working correctly, by a person or group sending a large amount of data at one time: --
2 abbreviation for disk operating system: a type of operating system for computers --
3 abbreviation for disk operating system: software that controls a computer system and manages the other programs, used mainly in older computers --