4, what doea hamlet ask horatio to do while everyone is watching the play? when the play has ended, what does horatio say/agree to that he noticed?

Horatio is Hamlet's faithful, reasonable friend in Hamlet by William Shakespeare. In many ways he is Hamlet's foil, representing everything Hamlet is not. Rather than immediately accepting his friends' word that the ghost of King Hamlet has been appearing, for example, he goes to see for himself; even then, he has to think things through before he concludes that it is the ghost of the dead king and before he will bother Hamlet with the news of these sightings.