A series of powerpoint slides John used for tutorials, plus postscript versions, can be found at ftp://ftp.scriptics.com/pub/tcl/doc/tut.tar.Z .
... device is covered by US patents 3,726,146 (1973) and 5,353,655 (1994) by L.A. Mishler and US patent 5,800,311 (1998) by P.S.Chuang. Externa ...