There are many ways to manage concurrency:  with threads, co-routines,
continuations, generators, ... and events.  A page on [Event programming and why it is relevant to Tcl/Tk programming]
explains some of the background behind Tcl's emphasis of the latter.

Events are a relatively "safe" programming model, particularly when compared to threading [[refer here to JO paper]].

Notice that C# makes events first-class objects.  This is consistent with Anders Hejlsberg's earlier work with Delphi ...
















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[[Also see [http://mini.net/tcl/2.html?event].]]