User interface > Debugging and executing > Stack window
Another window of its own is the stack window.
The stack window contains a list of all productions and branches, which are superior to the current node. By stepping from one production into a different or, if an optional branch is chosen, the name of the superior node is put into the first line of the stack window. The previous lines are moved one line below. So in the stack window, the sequence of nodes is displayed, which characterize the "way", to reach the actual node.
The preceding number denotes the level of look-ahead..
If you click on an item in one of the lists, the according node will be shown in the syntax tree and the section of text is marked too in the input window, which was recognized by the corresponding structure..