1. A graphics device adapted to operate in parallel with at least one other graphics device, the first graphics device comprising: a core unit adapted to execute commands; a front-end unit adapted to receive commands and deliver at least some of the received commands to the core unit, wherein the graphics device and the at least one other graphics device receive the same set of commands, and wherein the commands comprise control commands associated with program flow and rendering commands associated with determining pixel output of the graphics device; and wherein the front-end unit is further adapted to receive a first device mask command, the first device mask command including a reference to a unique identifier associated with the graphics device the identifier corresponding to a single bit in the device mask, and to begin discarding rendering commands received after the first device mask command when the bit associated the graphics device is negated, rather than delivering the rendering commands to the core unit.