content: The book has lots of information but one has to go through lots to loops to get to where the information should be and then it may not be there.E.g., the index has no mention of the 'wm' command--one that I often encounter.E.g., another book implies that there is a canvas command 'delete all'. After I finally got to page 61, I found the 'delete' command but NOT any hint that one can use the 'all' command to delete all the objects on the canvas.Another example, even though the book purports to cover TK--the visual side of the language--I find just one chart, .Needless to say, there are very few examples.