List nodes and their Login "Username" ?

I am seeing security violations in Windows Event logs showing that *something* is trying to use an old UserID.  I *think* the thing doing this is NCM.  I would like to find out what value is used for each node, in the Node Management "Edit Properties" screen Username field.

Most devices are set to "${GlobalUserName}" but I think *something* is using a specific UserID.

How can I get a list of Nodes and what value is in the "Username" field?

Thanks - Paul