Found the following hamletworks.org entries referring to line 600

View Commentary Note for 600
600 As to giue words or talke with the Lord Hamlet, 1.3.134

View Material Textual Note for 600
600 As to giue words or talke with the Lord Hamlet, 1.3.134

View Commentary Note for 601
601 Looke too't I charge you, come your wayes.1.3.135

View Commentary Note for 643
643 <Ghost beckens Hamlet.>..

View Material Textual Note for 643
643 <Ghost beckens Hamlet.>..