Concurrency Oriented Programming.

Think Massively concurrent systems or lots and lots of processes all talking to each other, each doing a specific thing that relies on the others to complete the system.

See [Erlang].

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[Silas] - How is threaded Tcl comparable to Erlang in a multiple processors/machines (clustering?) system? Is Tcl with the thread package able to do high concurrent programming?

[NEM] - Yes, Tcl can compete with Erlang in high concurrency. Indeed, until
recently, Erlang used "green" threads only rather than native threads and so
didn't take advantage of multiple processors/cores at all (other than by
using multiple OS processes). That has changed now, and I understand recent
Erlang runtimes can use several native threads (one per processor/core) to
schedule the software threads. In Erlang you would use threads for everything,
whereas in Tcl you'd typically use a few threads with each making use of
an event loop.
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[Category Glossary]