'''[http://www.stanford.edu/~ouster/cgi-bin/papers/tk-usenix.pdf%|%An X11 Toolkit Based on the Tcl Language]''' was presented by [John Ousterhout] at the [USENIX] conference in January, 1991 ** See Also ** [http://www.tcl.tk/about/history.html%|%History of Tcl]: <> Documentation | History of Tcl and Tk