In the early days the only information available to the user was in the hard-copy Users Guide.
This is now essentially redundant, but we have retained it in Help for those who want to run through it to obtain an overview of the programs.
The CPO package also includes a printable version. This has not been kept fully up-to-date, but is still useful as 'bedtime reading'.
In any case the material in the Help version of the Users Guide is fully cross-linked with the rest of Help.