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I contacted "exbanious" about this hack after not being able to get it to work.
And thought i should share the extra information you need to get this to work.
This hack for one only works with News 1.3 and up.
The first step is explained here:
adding a fulltext index to keywords
if you are using phpmyadmin to administer your MySQL database,
find your XOOPS database and click on xoops_stories table.
this will show you the list of fields for that table, find the "keywords" field and on the far right
under "Action" there is an icon with the letter "T" click that and it will make
a fulltext index for the keywords field. This needs to be set
for the "WHERE MATCH (keywords) AGAINST ('$article->keywords') " argument to work.