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I did it!After some exploring and hacking XOOPS code now i have not just unique titles/descriptions/keywords for every page.
Now keywords for every page ar added automatically according to news title. For example, if you will go at article
http://www.soft-news.net/m-news+article+storyid-599.html (about program called BlindWrite) and look at the source, you will see, that first keyword is - "Blindwrite", and the goes other keywords by the main text (Download, Shareware, etc...)
If you will open an article about "Windows XP" for example, the first keyword will be Windows XP.
After first SEO my Google traffic was bigger 3 times than usual XOOPS system, now it's more than 4 times bigger and growing... Yeah, Christmas time...
By the way, forums are optimized too. For example if you will create a topic with name "This is my topic", you won't see a link like here such as index.php&forum=xxx&topicid=xxx", URL is changed to /forum/This_is_my_topic.html"