Opus Reference Manual

Is there a downloadable or online reference manual other than the Help pages for Opus such as a PDF?
There is simply so much to this tool.
Thanks

Web and PDF versions of the manual are linked here:

gpsoft.com.au/manual9/opus_documents.html

I think they all contain the same text as the F1 help manual these days.

(Edit 2024: Manual for newer versions is here: Introduction [Directory Opus Manual] )

Leo
Thanks, Every bit helps.
Cheers