When is re-linking required?
TreePad's hyperlinking mechanism is extremely versatile. For instance, you can move a node or even an entire subtree to any location inside a database (e.g. by using drag-and-drop, tree copy⁄paste, cursor keys or menu⁄tree⁄move), all hyperlinks to nodes will remain valid!
Still, it is possible that one or more links to a node have become invalid after having deleted that node. In that case you can relink such an invalid hyperlink by clicking on it with the mouse, then change it with menu⁄edit⁄hyperlink or simply delete it.