A display device including an operator information storer for relating operator information and information concerning the type of language which the operator uses. The compounds and compositions of the invention can induce the biosynthesis of various cytokines and are useful in the treatment of a variety of conditions including viral diseases and neoplastic diseases. The solvent surface tension is no more than about, and preferably at least 2 dynescm less than, the surface tension of the reactive diluent. Also, the three-dimensional orientation of the pointing device may be measured. The non-spherical block portion is physically connected to the line portion, and the cross-sectional area of the non-spherical block portion is bigger than that of the line portion. The engine components have at least one sensor responsive to the engine component operation.