There are actually two aspects to this. No machine will know the reported values for any other machine, so this cannot be done purely in client relevance.
Instead, what you’ll need is to have each computer report its own MachineGUID value in an Analysis, and then use Session Relevance (in the Web Reports server or a REST API client) to find the values duplicated across the deployment.
To run Session Relevance in the Web Reports server, log in to the Web Reports server and open the hidden QNA page, by changing the end of the URL to
Then you can run a relevance query similar to
(Multiplicity of it, it) of unique values whose (multiplicity of it > 1) of values of results of bes properties whose (name of it = "MachineGUID" and name of source analysis of it = "My MachineGUID Analysis")