Found the following hamletworks.org entries referring to line 692

View Commentary Note for 692
692 Ghost. So art thou to reuenge, when thou shalt heare.1.5.7

View Immaterial Textual Note for 692
692 Ghost. So art thou to reuenge, when thou shalt heare.1.5.7

View Material Textual Note for 692
692 Ghost. So art thou to reuenge, when thou shalt heare.1.5.7

View Commentary Note for 693
693 Ham. What?1.5.8