Junior Creditor will further mark Junior Creditor's books of account, if any, in such a manner as shall be effective to give proper notice of the effect of this Agreement, and will, in the case of any Junior Debt which is not evidenced by any instrument, upon Senior Creditor's request cause such Junior Debt to be evidenced by an appropriate instrument or instruments endorsed with the above legend.  Junior Creditor will, at Junior Creditor's expense and at any time and from time to time, promptly execute and deliver all further instruments and documents, and take all commercially reasonable further action, that may be necessary or desirable, or that Senior Creditor may request, in order to protect any right or interest granted or purported to be granted hereby or to enable Senior Creditor to exercise and enforce its rights and remedies hereunder.