If you're looking for the PFTrack documentation it's all included as a set of HTML files in the application install folder on your computer. You can use the embedded help tools to search for specific information, as well as access learning articles and video tutorials.
Searching
The quickest way of accessing the documentation and other learning resources is to click the Help button at the top-left of the PFTrack window and search for what you're interested in using the search bar:
After entering some keywords, press the Return key, or click on one of the auto-complete options, and clicking on a link will open your desktop web browser to show that documentation page or article:
To go back to the top-level help menu list, just click the X button next to your search term and the menu will reset.
Browsing the documentation
If you'd like to browse the documentation pages directly, just click the Documentation link in the help menu. For immediate access to the documentation for the a particular node or tool you are currently using, click the ? button at the left of the node panel. This will open the relevant page in your web browser without needing to search for anything:
You can also get a brief description of any button or widget by hovering your mouse over it for a few seconds to open a tooltip. This popup will also show any available keyboard shortcut for the tool, and all shortcuts for the node can be displayed in a popup window by clicking the keyboard icon beneath the ? button.
Learning resources
The Help menu also contains useful links directly to other learning resources, such as in-depth tutorials, articles about key matchmoving concepts, and extended learning videos that are available here: https://www.thepixelfarm.co.uk/pftrack-learning