Is it possible to use the <meta keywords="..."> multiple times or does one cancel out the other? Our site automates the meta keywords for high-level sections based on the URL, so basically all the pages under a certain section contain the same keywords. I'd like to add additional keywords to individual pages if possible.

I realize not many search engines use the meta keywords anymore, but for those that do, I'd like to know my code isn't backfiring on itself.

Thanks.