> Among these, the term that actually _fascinated_ me is a
> "cluster". What I would like to know is- what can be called a cluster?
> and what cannot be?
> I tested my parallel search program using using 4-nodes running Linux
> and Open MPI. So have I implemented a Linux cluster?
Yes, you have created a cluster.
More information on general parallel/cluster computing topics can be
found at the Beowulf website:
Hope this helps,