In a cross reference, you must always name a node. This means that in
order to refer to a whole manual, you must identify the `Top' node by
writing it as the first argument to the @xref command. (This
is different from the way you write a menu entry; see Referring to Other Info Files.) At the same time, to
provide a meaningful section topic or title in the printed cross
reference (instead of the word `Top'), you must write an appropriate
entry for the third argument to the @xref command.
Thus, to make a cross reference to The GNU Make Manual, write:
@xref{Top, , Overview, make, The GNU Make Manual}.
which produces
*Note Overview: (make)Top.
and
See section "Overview" in The GNU Make Manual.
In this example, Top is the name of the first node, and
Overview is the name of the first section of the manual.