Clarified what Python versions the interactivity chapter applies to,

and what it doesn't apply to.

Doc/tut/tut.tex

@@ -3603,7 +3603,15 @@ input line and history substitution, similar to facilities found in
 the Korn shell and the GNU Bash shell.  This is implemented using the
 \emph{GNU Readline} library, which supports Emacs-style and vi-style
 editing.  This library has its own documentation which I won't
-duplicate here; however, the basics are easily explained.
+duplicate here; however, the basics are easily explained.  The
+interactive editing and history described here are optionally
+available in the \UNIX{} and CygWin versions of the interpreter.
+
+This chapter does \emph{not} document the editing facilities of Mark
+Hammond's PythonWin package or the Tk-based environment, IDLE,
+distributed with Python.  The command line history recall which
+operates within DOS boxes on NT and some other DOS and Windows flavors 
+is yet another beast.
 
 \section{Line Editing \label{lineEditing}}