Destroy (i.e. delete) windows and widgets
Name - a standard path-like name used to name the widget or window to be destroyed.
This command deletes the windows or widgets given by the Name arguments, plus all of their descendants. If a window ``.'' is deleted then the entire application will be destroyed. The windows are destroyed in order, and if an error occurs in destroying a window or widget the command aborts without destroying the remaining. No error is returned if Name does not exist.