Catalog the data sets prior to the edit session. You do not need DD statements in the user's logon procedure because the catalog is searched for their location. The first edit session, which occurs after you catalog the data sets, will initially use the data set userid.EDITUTL1. EDIT may also use userid.EDITUTL2 during this initial session if the user invokes certain subcommands such as RENUM. In later edit sessions EDIT may use one or both of these data sets, depending upon the functions invoked by the user and the timing of events which affect the user's edit session.