TWiki uses RCS to store page revision history and diffs. By default, TWiki calls the external RCS commands, but there is also a RcsLite Perl library with RCS functionality. RcsLite can be enabled if RCS is not installed, and/or is difficult to install, such as on Windows.
RCS is not required, that is, it is possible to drop plain text files into the TWiki data directories and they will be shown as regular TWiki pages. The revision file will be created the next time you save the page from the browser.
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