Registration of charges requires prompt filing and Registrar notification with procedures for satisfaction and modification. A security arises when property is agreed to secure repayment, yielding a charge which may be fixed or floating; floating charges remain until winding up or crystallisation and those created shortly before winding up are presumptively invalid unless solvency at creation is shown. Companies must file prescribed particulars and the instrument with the Registrar promptly after creation or acquisition of charged property, notify satisfaction of charges so the Registrar may record memoranda of satisfaction, and intimate any modification to charge terms within the prescribed period.