A calculator system for performing duplication of contents does not necessarily perform screening, i. The payload protocol follows, and is the real protocol that is used to exchange the data after the prefix protocol session. The sunshade device is provided with shielding members extending in the longitudinal direction of the guide rails and shielding the guide passages from the interior of the passenger compartment. Once magnetically aligned, each generator is essentially a line replaceable unit which may be readily mounted to any input of a multi-generator gearbox assembly with the assurance that the magnetic alignment will be within a predetermined tolerance. In another aspect the test solution is contacted with two or more simulated biological membranes to partition the one or more candidate compounds into the membranes.