Abstract: A method and apparatus for developing a computer screen layout provides a plurality of physically manipulable pieces each representing one of a plurality of computer screen objects. The pieces are removably secured to a surface representing a computer screen. The pieces are arranged on the surface to provide a proposed computer screen layout. The pieces may then be moved on the surface, added to the surface, or removed from the surface to provide a revised computer screen layout. The revised computer screen layout is then recreated in the computer program under development.

Abstract: Strong base quaternary ammonium cellulose derivatives prepared under anhydrous conditions are further chemically modified in selected organic solvents by a sequential process that produces a partial cellulose ether in fibrous form that can be used in electro-chemical reactions covering a range of oxidation-reduction potentials. These new derivatives can be prepared such that they stabilize a given anion in the cellulose matrix until such time as its oxidation or reduction power is needed in desired chemical reactions. Although prepared in nonaqueous media, these red-ox cellulosic anion exchangers can be used to regulate oxidation-reduction reactions in aqueous media. Some of these new red-ox anion exchangers are dispersible in water and can be reprecipitated by organic solvents without losing their red-ox abilities during the process. Others are water insoluble.