[Tcl] has a distinguished record of accomplishment in supporting [architecture]s
based on the publish-subscribe [pattern].
One prominent domain is [process control], where [CPU] bound Tcl to
Tibco and MQ [middleware], as well as a home-grown publish-subscribe bus.  CPU's 
current owners apparently have "buried" all these products.

Apparently XMLblaster
[http://www.xmlblaster.org/]
still lacks a demonstration client in Tcl as 2004 begins, although someone (?
Benno Lange?)
was working on it.  It '''ought''' to be straightforward ...

[Tuplespace] is a publish-subscribe mechanism, one with at least a couple of
distinct advantages, including the ease with which one can register interest in
a ''pattern'', and not just a variable.



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The "msg" [http://cfa-www.harvard.edu/~john/msg] interface that is used to operate F5 instrumentation at the MMT Observatory.  This client server API includes a complete pub/sub syncronious or async passing of scaler values and RPC of procs.  Its designed to be "so easy" that even a PhD can use it. [JBR]

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[[Explain how [Tequila] can be regarded as publish-subscribe.]]