Note to Hamlet, 3.3.3: "I your commission will forthwith dispatch"

Act 3, Scene 3, line 3
I your commission will forthwith dispatch: I will have your commission drawn up immediately. A "commission" is a grant of certain authority, and also the official document which states that authority. Rosencrantz and Guildenstern's commission is supposedly to demand tribute from England to Denmark, but as it turns out, they also carry with them another commission, demanding that the King of England behead Hamlet as soon as he arrives.