Mr. H.S. Chowdhary has no locus standi (a) to file the petition under Article 51 A as a public interest litigant praying that no letter rogatory/request be issued at the request of the CBI and he be permitted to join the inquiry before the Special Court which on 5.2.90 directed issuance of letter rogatory/request to the Competent Judicial Author ities of the .Confederation of Switzerland; (b) to invoke the revisional jurisdiction of the High Court under Sections 0397 read with 401 of the Code of Criminal Procedure chal lenging the correctness, legality or propriety of the order dated 18.8.90 of the Special Judge and (c) to invoke the extraordinary jurisdiction of the High Court under Section 482 of the Code of Criminal Procedure for quashing the First Information Report .dated 22.1.90 and all other proceedings arising therefrom on the plea of preventing the abuse of the process of the Court.