Pairwise interacting (qu)bits can be used to perform universal (quantum) computation. The causaloid formalism was originally developed as a tentative step in the direction of constructing a theory of quantum gravity. This framework treats space and time on an equal footing. Further, it is time-symmetric. It is possible to put the theory of interacting bits (in the classical case) and of interacting qubits (in the quantum case) into this framework. It is hoped that, by placing classical and quantum theory in this framework, we can gain some insight into the nature of information processing in the two theories.