The global direction associated output unit may be changed by specifying the
Texinfo code name of a @node. The direction should then be linked to
the output unit of that node in headers. Use
texinfo_register_global_direction to change a direction link.
$direction is a global direction (see Directions), $texinfo_node_name is an optional node name Texinfo code. The $direction will point to the output unit associated to the $texinfo_node_name node name, if set and the node exists in the Texinfo document.
For example, to have the Index direction be associated to the output unit of the ‘Main @emph{Index}’ node, call
texinfo_register_global_direction ('Index', 'Main @emph{Index}');