The online help documentation is arranged in separate pages or topics. It is designed to be suitable both for reference or to be read from beginning to end.
Use the CatDV Help menu command to access online help:
The online help text is also available as a standalone Reference Guide which you can view or print out with your web browser.
The old CatDV Pro 3.0 User Manual is a separate PDF document including screen shots and additional background material that you can download. Although it hasn't been updated to later versions, if you're new to CatDV you might want to browse the PDF user manual first as an introduction.
You should also refer to the Support FAQ on the CatDV web site if you encounter any difficulties as this contains lots of useful tips and explanations.