As already said, it may also be necessary for certain elements of a host country agreement, in particular those that protect data collected during the process, to remain in force at the end of an agreement or memorandum of understanding. Such a clause would be particularly appropriate to protect against the disclosure of information collected in the context of the external voting programme for purposes other than the facilitation of voting. Examples of agreements in host countries are the agreements signed in the context of Afghanistan`s 2004 presidential elections, the largest external electoral programme to date in terms of registered voter numbers and external turnout. The Afghan government and the United Nations Assistance Mission in Afghanistan (UNAMA) have signed two memoranda of understanding with the governments of Iran and Pakistan. These MOUs provided that the two host governments would provide broad support to the external electoral programme, including security of registration and voting centres, escorts for the transport of electoral materials, and support for political education and public information campaigns. When external votes take place in several countries, agreements between host countries often vary from country to country. A certain degree of standardisation between agreements is essential to ensure transparency and integrity of the electoral process, in particular with regard to sensitive issues such as election eligibility and registration. However, if an election is held in several countries at different levels of development, some procedural and logistical differences may be inevitable. In order to make its dispute settlement services more accessible, the PCA has adopted a policy of concluding “host country” agreements with the parties to the 1899 or 1907 Convention on the Settlement of International Disputes. Dispute resolution managed by the BCP includes arbitration, mediation, conciliation and inquiry commissions. Through a host country agreement, the host country and the PCA create a legal framework for the ad hoc implementation of future procedures managed by PCAs on the territory of the host country, without the need for a permanent physical presence of PCAs in that region. .