You can use the CurrentRecord property to identify the current record in the recordset being viewed on a form.
Setting
Microsoft Access sets this property to a Long Integer value that represents the current record number displayed on a form.
The CurrentRecord property is read-only in Form view and Datasheet view. It's not available in Design view. This property is available only by using a macro or Visual Basic.
Remarks
The value specified by this property corresponds to the value shown in the record number box found in the lower-left corner of the form.