1 . COMPETITION - DOMINANT POSITION - ACTIVITIES OF A NATIONAL TELECOMMUNICATIONS UNDERTAKING - EXERCISE BY THAT UNDERTAKING OF RULE-MAKING POWERS - APPLICATION OF ARTICLE 86 OF THE TREATY ( EEC TREATY , ART . 86 ) 2.COMPETITION - DOMINANT POSITION - ABUSE - PROHIBITION BY AN UNDERTAKING HOLDING A STATUTORY MONOPOLY ON TELECOMMUNICATIONS OF CERTAIN ACTIVITIES OF PRIVATE MESSAGE-FORWARDING AGENCIES - CRITERIA FOR APPRAISAL ( EEC TREATY , ART . 86 ) 3.APPLICATION FOR ANNULMENT - SUBMISSIONS - INFRINGEMENT OF ARTICLE 90 ( 2 ) OF THE TREATY PLEADED BY A MEMBER STATE OTHER THAN THE MEMBER STATE WHICH CONTROLS THE UNDERTAKING IN QUESTION - WHETHER ADMISSIBLE ( EEC TREATY , ART . 90 ( 2 ) AND FIRST PARAGRAPH OF ART . 173 ) 4.MEASURES ADOPTED BY INSTITUTIONS - STATEMENT OF REASONS - DUTY - SCOPE ( EEC TREATY , ART . 190 )