* Note: The information in this file is outdated.  According to
* <URL:http://www.cs.umn.edu/Research/GroupLens/>, the trial of the
* collaborative filtering system for Usenet is finished.
* Chris Siegler <siegler@visi.com> told me he had a working implementation 
* of a BBB server.  Although it's currently not online, I'll keep GroupLens
* support in slrn for now.

The GroupLens support should work on most Unix systems.  It may even
work for OS/2 or VMS.

For information about GroupLens, see

    http://www.cs.umn.edu/Research/GroupLens/trial.html

Edit src/slrnfeat.h to enable support for GroupLens,

The next step is to create a file called .grplens in your home
directory.  This file must contain lines such as:

PSEUDONYM your-pseudonym
BBBHOST grouplens.cs.umn.edu
BBBPORT 9000
comp.os.linux.misc
     .
     .
rec.food.recipes
rec.arts.movies.current-films

The last lines in the file consist of newsgroup names.  See
http://www.cs.umn.edu/Research/GroupLens/trial.html for information
about which groups are supported.

The PSEUDONYM line must contain a registered pseudonym.  To register a
pseudonym, see http://www.cs.umn.edu/Research/GroupLens/trial.html for
a registering link.

Once you have created your .grplens file with a registered pseudonym,
you need to add the line

   set use_grouplens 1

to your .slrnrc file.  After doing that, simply run slrn.  When you
enter a supported newsgroup, slrn will retrieve rating for the
newsgroup from the GroupLens server and display the ratings in the
header summary window.  The display format is set via the DISPLAYTYPE
line in your .grplens file.  Again, see the GroupLens web page for
supported DISPLAYTYPE or look at the documentation in the GroupLens
library directory.

To rate articles that you have read, simply press `0' followed by an
integer `1' through `5' where `1' is a low rating and `5' is a high
rating. After leaving the newsgroup, slrn will send your ratings back
to the GroupLens server.  Note: Only those newsgroups that the
GroupLens server supports which are also listed in your .grplens file
may be rated.

The header display in a group for which GroupLens ratings have been
requested, will include a ratings field.  The ratings field will
either consist of one or more `*' characters, or a `?'.  The `?' means
that there is no GroupLens information for the article for which the
header refers.  Articles for which GroupLens information is available
will contain one or more `*' characters on the header lines to
indicate a rating of 1 to 5.