My friend gets a 6 months B2 visa, but at Point of Entry , the inspector wrote NO COS EOS on the I94, he said that means no change of status, no extend of stay. My friend came here in the past several times, and each time left in time without any status violation and each time applied B2 extension without any problem. My question is that what's the implication of these markers? It that saying even there is no way to extend the stay if he intends to, or in another words he cannot apply for extension, even if applied it will deined anyway by INS (? who is handling these anyway)? What about the NO COS? Any insight, thanks