-@code{idlwave-help-browser-function} controls which browser help is
-sent to. This function is used to set the variable
-@code{browse-url-browser-function} locally for IDLWAVE help only.
-Customize this variable to see what choices of browsers your system
-offers.
-
-Certain browsers like @code{w3} and @code{w3m}
-(@uref{http://emacs-w3m.namazu.org/}, the author's help browser of
-choice) are run within Emacs, and use Emacs buffers to display the
-HTML help. This can be convenient, especially on small displays, and
-images can even be displayed in-line on new Emacs versions. However,
-better formatting results are often achieved with external browsers,
-like Mozilla. IDLWAVE assumes any browser function containing "w3" is
-displayed in a local buffer. If you are using another Emacs-local
-browser for which this is not true, set the variable
-@code{idlwave-help-browser-is-local}.
-
-@emph{N.B. For Windows users}: IDLWAVE can bring up help directly
-from the Microsoft HTMLHelp documentation supplied with IDL: no
-additional help files are needed. Be sure to set
-@code{idlwave-system-directory} and the help file will be found
-automatically (or, alternatively, specify its location directly with
-@code{idlwave-html-help-location}). The variable
-@code{idlwave-help-use-hh} controls whether HTMLHelp is used, and
-which application is called to invoke it (@code{HH} is the default).
-The free helper application @code{KEYHH}
-(@uref{http://www.keyworks.net/keyhh.htm}) can be used instead, and is
-preferrable, as it permits loading new help topics into the same help
-window. @code{KEYHH} must be downloaded and installed separately.
+@code{idlwave-help-browser-function} controls which browser help is sent
+to (as long as @code{idlwave-help-use-assistant} is not set). This
+function is used to set the variable @code{browse-url-browser-function}
+locally for IDLWAVE help only. Customize the latter variable to see
+what choices of browsers your system offers. Certain browsers like
+@code{w3} (bundled with many versions of Emacs) and @code{w3m}
+(@uref{http://emacs-w3m.namazu.org/}) are run within Emacs, and use
+Emacs buffers to display the HTML help. This can be convenient,
+especially on small displays, and images can even be displayed in-line
+on newer Emacs versions. However, better formatting results are often
+achieved with external browsers, like Mozilla. IDLWAVE assumes any
+browser function containing "w3" is displayed in a local buffer. If you
+are using another Emacs-local browser for which this is not true, set
+the variable @code{idlwave-help-browser-is-local}.
+
+With IDL 6.2 or later, it is important to ensure that the variable
+@code{idlwave-system-directory} is set (@pxref{Catalogs}). One easy way
+to ensure this is to run the IDL Shell (@kbd{C-c C-s}). It will be
+queried for this directory, and the results will be cached to file for
+subsequent use.