Controlled interaction of two erlang distributed networks

[Richard Andrews]

I have a distributed system that needs to run on two geographically
isolated sites. Each site has a central manager node.

I want a way to have the manager nodes from each site use erlang
monitoring of each other and some specific processes only on the
manager nodes; but I want to avoid node lists and global registrations
expanding such that the nodes on different sites try and become
connected together.

How can I achieve this?

--
  Rich