A method for fuel injection in a four-stroke combustion engine of piston-and-cylinder type with compression ignition, whereby a specified fuel quantity is supplied to a combustion chamber for each working cycle, and whereby EGR gases are led back to the combustion chamber. A host database, preferably web or internet based, is implemented for storing diabetes care data relating to multiple diabetics. It is then determined if the essentially sequential application code can be separated at at least one of said user-defined tasks boundaries and if so at least one code of the plurality of codes for at least one of said tasks is automatically generated.