They would need to be managed clients.

Shared Insight Cache option itself must be specified firstly on the SEPM Server - have a look ast some documentation:

https://www-secure.symantec.com/connect/blogs/shar...

http://www.symantec.com/business/support/index?pag...

http://www.symantec.com/docs/HOWTO55311

Shared Insight Cache runs independently of Symantec Endpoint Protection. However, you must configure Symantec Endpoint Protection Manager to specify the location of Shared Insight Cache so that your clients can communicate with Shared Insight Cache.

Hi,

Shared Insight Cache is a Web service that runs independently of the client. However, you must configure Symantec Endpoint Protection to specify the location of Shared Insight Cache so that your clients can communicate with it. Shared Insight Cache communicates with the clients throughHTTPor HTTPS. The client's HTTP connection is maintained until the scan is finished.

Note: Shared Insight Cache is only available for the clients that perform scheduled scans and manual scans

Symantec Endpoint Protection Shared Insight Cache User Guide 12.1

http://www.symantec.com/docs/DOC4334

Shared Insight Cache - Best Practices and Sizing guide

http://www.symantec.com/business/support/index?page=content&id=TECH174123

Installation and Configuration of SEP Shared Insight Cache

http://www.symantec.com/docs/TECH185897

Viewing Shared Insight Cache events in the Cache Server log

http://www.symantec.com/docs/HOWTO55316

How Shared Insight Cache works

http://www.symantec.com/docs/HOWTO55318

About the Symantec Endpoint Protection Shared Insight Cache tool

http://www.symantec.com/docs/HOWTO55311

Customizing Shared Insight Cache settings

http://www.symantec.com/docs/HOWTO55314