

   OOnnlliinnee DDooccuummeennttaattiioonn

        help(topic, package = .packages(), lib.loc = .lib.loc)

        ?topic

   AArrgguummeennttss::

      topic: a name or character string on which documentation
             is sought.

    package: a name or character vector giving the packages to
             look into for documentation.  By default, all
             packages in the search path are used.

    lib.loc: A character vector of directory names of
             libraries.  Defaults to all libraries currently
             known.

   DDeessccrriippttiioonn::

        These functions provide online access to documentation.
        Documentation on a topic with name `name' (typically,
        an object or a data set) can be printed on-screen with
        either `help(name)' or `?name'.  In the case of unary
        and binary operators and control-flow special forms,
        the name may need to be be quoted.

   SSeeee AAllssoo::

        `help.start()' which opens the HTML version of the Man-
        ual; `library' for listing available packages and the
        user-level objects they contain; `data' for listing
        available data sets; `methods'.

   EExxaammpplleess::

        help()
        help(help)                   # the same

        help(lapply)
        ?lapply                      # the same

        help("for")                  # or ?"for", but the quotes are needed
        ?"+"

        data()                       # list all available data sets
        ?women                       # information about data set "women"

