initiator

initiator [i′nish·ē‚ād·ər]

(chemistry)

The substance or molecule (other than reactant) that initiates a chain reaction, as in polymerization; an example is acetyl peroxide.

(computer science)

A part of an operating system of a large computer that runs several jobs at the same time, setting up the job, monitoring its progress, and performing any necessary cleanup after the job's completion.

(ordnance)

A device used as the first element of an explosive train, such as a detonator or squib, which upon receipt of the proper mechanical or electrical impulse produces a burning or detonating action; it generally contains a small quantity of a sensitive explosive.

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initiator - SCSI initiator