How tell to a boy cat from a girl cat?

first of all how to tell a boy cat from a girl cat is for a boy try looking at there but and you see two circles its hard to explain so ill dend ya the link from how to tell them apart the first link will explain better http://www.peteducation.com/images/articles/kitten_gender.gif http://www.thepetcenter.com/exa/kitx1.jpg http://www.peteducation.com/article.cfm?c=1+1388&aid=923 hope this helps!