Distributed shared memory

I am reading about a solution that includes the term distributed shared memory.  The concept is that there are 3 or 4 physical machines that share the same memory, apparently the way multiple machines can share an NFSv4 disk partition

Can someone please explain to me how this works.  How can one machine access the memory of another machine.  How would this work?
Anthony LuciaAsked:
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Usually one uses some abstraction library for that
Gerwin Jansen, EE MVETopic Advisor Commented:
There is a lot to read about that subject, a Memory Manager would arrange access for each node to the DSM.

What are you reading exactly?

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According to me there should be much longer discussion on what are the needs of asker... (i.e. my comment is not answer either).
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Anthony LuciaAuthor Commented:
The expert was participating in a discussion that was helping solve the problem,  He suggested that I read further on the subject, and doing so helped me to understand the issue with greater clarity
Gerald ConnollyCommented:
No mention of Super computers or NUMA in this discussion
it did not get that far....
Gerald ConnollyCommented:
@g - my point, hopefully emphasising yours!
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