1. A method of input signal resolution in a process control system having a plurality of actively redundant process control computers, where each of said actively redundant process control computers receives corresponding input signals from the physical process being controlled, comprising the steps of: mutually exchanging at least one block of said corresponding input signals between each of said actively redundant process control computers, each of said blocks of corresponding input signals including at least one input signal from the physical process being controlled, a first indicator which represents the validity of the at least one input signal contained in said block and a second indicator which characterizes the block of input signals to be exchanged; performing at least one comparison to each of said actively redundant process control computers using said second indicator to determine the success of said mutual exchange of said block of corresponding input signals; individually selecting an input valve at each of said actively redundant process control computers for each of said input signs exchanged, said selecting step being responsive at least in part to said first indicator to determine which of said corresponding input values to select; and recording an indication at each of said actively redundant process control computers to identify which of the corresponding input signals were selected by that actively redundant process control computer.