http://tcllib.sourceforge.net/doc/comm.html

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Background: comm is a '''comm'''unication package. It essentially reimplements the [send] command known from [Tk] in terms of sockets. The original author is John Robert LoVerso.

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Can one use comm as an exact replacement for send?  Apparently not - using
send, an interpreter registers itself and other Tk applications can query
this registry to find out what interpreters are available.  If you are just
using comm, this is not the case.
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[Category Package], subset [Tcllib]