The `Top' node is the node from which you enter an Info file.
A `Top' node should contain a brief description of the Info file and an extensive, master menu for the whole Info file. This helps the reader understand what the Info file is about. Also, you should write the version number of the program to which the Info file applies; or, at least, the edition number.
The contents of the `Top' node should appear only in the Info file; none
of it should appear in printed output, so enclose it between
@ifinfo and @end ifinfo commands. (TeX does not
print either an @node line or a menu; they appear only in Info;
strictly speaking, you are not required to enclose these parts between
@ifinfo and @end ifinfo, but it is simplest to do so.
See section Conditionally Visible Text.)