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If I click 'Search' in the bar next to 'Start A Thread' and 'Settings' on the forum, there are check boxes to search the Forum, App Notes, and/or Downloads in addition to the Knowledgebase. Very often I'm trying to find specific posts in the forum, so I want to exclude knowledgebase articles. On the other hand, if I click 'Search' between 'Support' and 'Index' in the bar right at the top of the page, this only gives the option to search the entire Keil site - no choices at all!
"I did it that way to sort-of force people to search the knowledgebase..." It did cross my mind that might've been your intention... ;-) However, there do now seem to be three different 'Search' forms on the site - which is rather confusing!