I am looking for a detailed definition/discussion of Mumps globals implementation. There is a document titled "MUMPS Globals and Their Implementation", but I have not been able to find any way to order it, let alone access a digital copy. (it was printed in 75)
In general I am trying to find an in depth discussion of Mumps' database internals.
I would assume that the database internals will differ greatly between the various MUMPS implementation. So, I think your best bet would be to look at how it is done in the open source MUMPS implementation :