thanks - if you look at my last post, I think those variables are set correctly now, at least the SwarmCoordinator shows me what looks like functional communication. Both of my machines are in a group called WORKGROUP, and this is specified for both AgentGrooupName and AllowedRemoteAgentGroup. Each machine also has the Other machine specified as AllowedRemoteAgentNames.
My breakthrough came after changing AgentGrooupName and AllowedRemoteAgentGroup from default to WORKGROUP, which is what my windows group is set to.
Once I get it working between two machines, I will add a third, also in group WORKGROUP, by adding its name to AllowedRemoteAgentNames after a comma.
Right?