A method for determining the viscosity and relative change of viscosity of a fluid over plural shear rates caused by a decreasing or increasing pressure differential resulting from fluid flow to a defined chamber in a capillary system. The systematic bit data and the parity bit data are modulated independently of each other such that communication quality is better when a modulation scheme for the systematic bit data is changed than when a modulation scheme for the parity bit data is changed. The resources available to the isolated processes may represent some subset of global resources.