Where do i find the certificate of authenticity numbers on my dell computer?

Its normally located on a sticker on the side of your tower or on the bottom if you've got a laptop. DELL.com/support/topics/global.aspx/support/dsn/document?c=us&l=en&s=gen&dn=FA1035591#2">http://support.DELL.com/support/topics/global.aspx/support/dsn/document?c=us&l=en&s=gen&dn=FA1035591#2