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About Thalia User Help:
Thalia's User Help is located here. 
User Help is produced in Helpmatic Pro, a 40$ tool that runs only on Windows. HelpMatic has some quirks, but the trade-off in price makes it an excellent solution.
Releases:
1.6 was released September 2008
1.7 was released January 21, 2009
1.71 was released March 4, 2009
Thalia User Help 1.0
[How to Write Thalia User Help ]
Feedback from Heather Anne Harrison, 4/15/2008 (most edits done).