Method of controlling printing on both surfaces of a sheet of print media

A method of controlling printing on both surfaces of a sheet of print media, the method including the steps of:receiving data relating to a first page to be printed in a first print controller of a first print engine;transmitting the data relating to the first page from the first print controller to a second print controller of a second print engine;receiving data relating to a second page to be printed in the first print controller; andcontrolling printing by the print engines under command of the first print controller to achieve synchronisation of printing of the pages by the first print controller and the second print controller on rear and front surfaces of the print media, respectively.