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Thank you Stewdio:
I was thinking of something like a "completed task" signal:
Imagine this is the "Index" of the content:
- Book 1 :: progress = x%
+Chap 1:: completed
+Chap 2:: Completed
+Chap 3:: Not Completed
etc.
In this case it is the Bible, but something like this coud help you keep track of tutorials for example. It is like keeping your advence in a project, in this case readings, in a tutorial this could be exercises. Well, thank you again for your advise.