For each common block defined in the scope of a subroutine or function, TotalView creates an entry in that function’s common block list. The Stack Frame Pane displays the name of each common block for a function. The names of common block members have function scope, not global scope.

If you dive on a common block name in the Stack Frame Pane, the debugger displays the entire common block in a Variable Window, as shown in Figure 152.) 

Window 1 in this figure shows a common block list in a Stack Frame Pane. After several dives, Window 2 contains the results of diving on the common block.

If you dive on a common block member name, TotalView searches all common blocks in the function’s scope for a matching member name, and displays the member in a Variable Window.