>>>See comment in line. I don't understand that syntax.
>>
>>The TTreeNode class has left and right pointers of the same class.
>
>Hi,
>

public TTreeNode left, right;

is just a shortcut for :
>

 public TTreeNode left;
>public TTreeNode right;

i.e. just declaring two TTreeNode objects....
>HTH,
>Viv

Yes, I know, hopefully it's clearer for Kevin too now.