Trend Micro Apex One documentation includes the following:

Trend Micro Apex One Documentation

Documentation
Description
Administrator's Guide
A PDF document that discusses getting started information, Security Agent installation procedures, and Trend Micro Apex One server and agent management
Help
Web-based ASPX or local HTML files that provide "how to's", usage advice, and field-specific information. The Help is accessible from the Trend Micro Apex One server and agent consoles.
Readme file
Contains a list of known issues and basic installation steps. It may also contain late-breaking product information not found in the Help or printed documentation
Knowledge Base
An online database of problem-solving and troubleshooting information. It provides the latest information about known product issues. To access the Knowledge Base, go to the following website:
http://success.trendmicro.com/
Download the latest version of the PDF documents and readme at:
http://docs.trendmicro.com/en-us/enterprise/apex-one-as-a-service.aspx