I think in most cases it will indeed be used in an interrogative tone, and written followed by a question mark to reflect that. It can also be used to mean "is

I think in most cases it will indeed be used in an interrogative tone, and written followed by a question mark to reflect that. It can also be used to mean "isn't it", to ask for agreement, approval (very informal). Example: il fait beau, hein? (The weather is good, isn't it?). The proper way to say "isn't it" is "n'est ce pas", but it's very rarely used in practice, and English people speaking French are often caricaturized ending all their sentences with "n'est ce pas", which is not very far from reality in my experience ;)