Please check out documentation for the following products:

Parallels Plesk Panel

Parallels Plesk Sitebuilder

Parallels Plesk Expand

Parallels Plesk Billing

Parallels Virtuozzo Containers

Microsoft Windows Updates supported by Parallels Virtuozzo Containers

Parallels Server for Mac (pdf)

Parallels Desktop for Mac

Parallels Desktop Expert Support

Parallels Business Automation Standard

Parallels Control Panel Pro

Parallels Helm

Parallels H-Sphere

Note: Documentation for other products is shipped directly with them and is available after installation.