Sisendi ja väljundi jaoks on operatsioonisüsteemidel kaasas palju teeke, mis suhtlevad operatsioonisüsteemi tuumaga; tuum vastutab riistvara juhtimise eest. Lisaks kasutavad programmid tihti kasutatava programmeerimiskeelega kaasas olevaid standardteeke.
A library is also a collection of implementations of behavior, written in terms of a language, that has a well-defined interface by which the behavior is invoked.
Online Language Learning Tool SkELL allows users to search for phrases in sentences, collocates and similar words. These examples have been automatically selected and may contain errors.