A Windows 3.1 application is shown for editing, analyzing, optimizing, designing technologies and determining the optical constants out of the (R,T) measurements. A dynamic arborescent structure of data (optical coatings) has been used, allowing a great flexibility in describing the optical coatings. The optical coatings of the arborescent structure are defined on the same thin films (defined in root), the change of a layer being detected by all the optical coatings of the arborescent structure, containing that layer. The layers are seen by coatings by mean of some groups (structures) of layers and some scale factors, the groups being the elements that describe the coating. So, one can study an optical coating or parts of coating (e.g. optical monitoring) under different conditions.