Polycom has published several helpful User Guides, Quick User Guides, and Quick Tips reference sheets.
Polycom VVX400 and VVX410 User Guide
This is a comprehensive User Guide published by Polycom for the VVX400 and VVX410 series phones. This is a very detailed guide for digging into the details.
Polycom VVX400 Series Quick User Guide
This is meant to be a quick reference sheet that can be printed and handed out to new users of the Polycom VVX400 and VVX410 Series phones.
Polycom VVX400 Series Quick Tips
Another quick reference sheet that can be printed and handed out to new users of the Polycom VVX400 and VVX410 Series phones.