HCP v7.2 and newer software offers a choice of PDF or HTML-based product documentation.
HCP manuals corresponding to a specific software release can always be accessed online and downloaded from the HCP management interface: System Management Console and Tenant Management Console. This includes both the PDF documents and HTML-based online help in a zipped format.
The HTML online help can then be installed on any platform with a browser (computer, tablet, smartphone) for later viewing. HTML offers a search function that allows to find topics that may exist in multiple HCP manuals more easily.
If you do not have an installed HCP system handy but still need to learn about HCP, you can find HCP documentation for the most recent (or historical) HCP releases on the web here: Content Platform - Hitachi Vantara Knowledge.