Linking standalone client to SEPM

I believe there is a way to link a standalone SEP client to SEPM (as opposed to having used a deployment package generated from SEPM) using a syslink.xml file.

Does anyone have any details on how to achieve this please?

If it makes any difference, this would be SEP 14 on Win 10, connecting to a SEPM 12.1.5 (and yes, I know SEPM needs updating!! Just need a quick fix for today)