The tkWWW hypertext window

The tkWWW hypertext window is responsible for displaying hypertext. Within the hypertext window, there are highlighted regions known as anchors. By clicking on the anchors, you can cause various things to happen.
Button 1
causes tkWWW to display the document link in the current window
Button 2
causes tkWWW to display the document link in a new window
Button 3
produces a popup box which contains the address of the document