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See also
Developing plugins,
Developer's Bible,
Technical Overview
internal package
TwistyPlugin
If no ID is passed, creates a new unique id based on web and topic.
Reads a setting from the FOSWIKIPREF cookie.
Returns:
- 1 if the cookie has been set (meaning: show content)
- 0 if the cookie is '0' (meaning: hide content)
- undef if no cookie has been set