++++ 1. Officials ° Conditions of employment ° Duty to be at all times at the disposal of their institution ° Meaning ° Obligation for those concerned to communicate their private address when required by the administration ° Failure to comply ° Disciplinary measure (Staff Regulations, Art. 55, first para.) 2. Privileges and immunities of the European Communities ° Officials and other servants of the Communities ° Exemption from formalities for the registration of aliens ° Communication by the institutions of officials' private addresses to the national authorities of the host country (Protocol on the Privileges and Immunities of the European Communities, Arts 12(b) and 16; Staff Regulations, Art. 23, second para.)