by "dealings with othello" means how iago got othello to kill desdemona and in the end himself.
so its asking how iago uses these characters to get othello to kill himself (seeking his revenge on othello)
its a hard question to understand.
i think its asking how Iago manipulates CAssio, Emilia DEsdemona and Rodrigo in order to seek revenge on Othello; which is his whole focus. he has to manipulate the other characters to get to othello. does that help?
yeah im also interested in doing graphic design when i leave school, im lucky my aunt is a graphic designer and has her own business, shes done such things as the new abc logo...anyway she went to UTS and im hoping to go there or billy blue, im doing a certificate 3 course for design...