Hi Lilybiri,
Thanks for your reply and the link to your blog.
Continue: Can you just explain yor statement "Continue can also be a choice in a conditional action, when one of the branching commands has nothing to do special but to advance.". When you say "branching command" i'm assuming you mean "IF ELSE statements" and "to advance" is that to the next decision if there is one? and if you didn't include "Continue" would it still advance?
Custom: I see what you mean the first is an AND statement and the rest are OR statements.
Nested advanced actions: I picked the term up from the Adobe web site comment by "Hari" on Shared Actions, who i took to be an Adobe person. Maybe i didn't understand the context.
http://blogs.adobe.com/captivate/2013/07/shared-actions.html
On Demand: Is there an up to date link. I found this one but the latest recordings are May (advanced action - part 8), and there isn't much training after May so it may be while before your Shared Actions are uploaded.
Donal