The diplomatic corps may also cooperate amongst itself on a number of matters, including certain dealings with the host government. In practical terms, the doyen of the diplomatic corps may have a role to play in negotiating with local authorities regarding the application of aspects of the Vienna Convention on Diplomatic Relations and diplomatic immunity, such as the payment of certain fees or taxes, since the receiving country is required "not to discriminate between states". In this sense, the doyen has the role of representing the entire diplomatic corps for matters that affect the corps as a whole, although this function is rarely formalized.