18 (a) to seize an ICT device used to store information or secure it in another way; (b) to make and retain copies of those computer data; (c) to maintain the integrity of the relevant stored computer data; and (d) to remove data in the ICT device stored or processed in the electronic form. 4. Each State Party shall adopt such legislative and other measures as may be necessary to empower its competent authorities to order, under the procedure established by its domestic legislation, any person who has special knowledge about the functioning of the corresponding information system, information and telecommunication network or their parts or measures applied to protect the information therein, to provide the necessary information and/or providing assistance in undertaking measures, referred to in paragraphs 1 - 3 of this Article. 5. The powers and procedures referred to in this Article shall be established in accordance with the provisions of Articles 21 and 22 of this Convention. Article 27. Real-time collection of traffic technical parameters 1. Each State Party shall adopt such legislative and other measures as may be necessary to empower its competent authorities to: (a) collect or record, through the application of technical means, in the territory of that State Party, technical parameters of the traffic transmitted with the use of ICT; and (b) oblige service providers, within their existing technical capability: - to collect or record through the application of technical means on the territory of that State Party technical parameters of the traffic; or - to cooperate with and assist the competent authorities of that State Party in collecting or recording in real time technical parameters of the traffic associated with specified information in the territory of that State Party.