This article explains where to find the DevViewer tool, which helps you find hardware device ID's for device blocking in Symantec Endpoint Protection (SEP) and Symantec Endpoint Security (SES).
DevViewer shows the windows hardware devices tree. It allows you to easily find and copy the GUID or Device ID for a device, to use in an Device Blocking policy in the Symantec Endpoint Protection Manager (SEPM) console or the cloud console. The tool can be used with Symantec Endpoint Protection and Symantec Endpoint Security.
Depending on the version you use, DevViewer appeared on CD2 under Tools\NoSupport\DevViewer, on the installation disk Part 2 Tools under DevViewer or under the Tools folder in the full installation zip file.
Starting SEP 14.3 RU2 DevViewer isn't included in the installation media anymore and can only be downloaded from this article.