Some of Tcl's documentation refers to ''procedure''s
as a distinct type of command.

A ''procedure'' is a Tcl command that is created
by the [proc] command.

For example the [info args] command expects its
argument to be the name of a procedure.  Names 
of other commands passed to [info args] will
cause an error to be raised.

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see also [Pass by reference] and [Implicit upvar].

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