Starting with version 7.1, Apple unified the implementation of non-Roman script systems in a programming interface called WorldScript.
Support for new script systems was added by so-called Language Kits.
Some kits were provided with foreign versions of the system software, and others were sold by Apple and third parties.
However, WorldScript remained the dominant technology for international text until Mac OS X, because of limited application support for ATSUI.
Good international support gave a marketing edge to word-processing programs such as Nisus Writer and programs using the WASTE text engine, because Microsoft Word prior to version 2001 was not WorldScript aware.