. . . . "Citations de brevets Brevet cit??? Date de d???p???t Date de publication D???posant TitreUS520874819 juin 19894 mai 1993Action Technologies, Inc.Method and apparatus for structuring and managing human communications by explicitly defining the types of communications permitted between participantsUS521660317 oct. 19901 juin 1993Action Technologies, Inc.Method and apparatus for structuring and manag" .