Abstract: A horseshoe (110) comprising a core (30) of rigid material sandwiched between two layers (40, 50) of shock absorbing elastomeric material. At least one of the elastomeric layers (40, 50) is bonded to the core (30) at a face (31, 33) where the core (30) has a plurality of indentations (32) or a plurality of raised humps (34). A preferred shoe (110) has raised lips (160, 164) and ridges (170) formed in its lower face (146).

Abstract: A method for managing documents by means of a computer system includes the steps of recording an expected return-time for each document issued to a party external to the computer system. In the event that the return of the document from the external party is not entered into the computer system by the expected return-time then the computer system issues an operator alert so that an operator may take steps to recover the document. In a preferred embodiment each document has associated with it a time dependent reliability parameter indicating a reliability time-frame. Documents issued outside the reliability time-frame are printed with a warning that the veracity of the data contained in the document is doubtful.