An optical write apparatus has an image display screen 102 for displaying an image and role switch section 105 for switching the image display screen 102 between a role in displaying an image for observation and that in writing an image onto an image record medium 10 onto which an image is written upon application of light for representing the image. The gas treatment atmosphere includes a primary gas treatment mixture comprising excited or unstable gaseous species obtained from a device which converts an initial gas mixture into said species, and an adjacent gas treatment mixture comprising at least one gas precursor required to form said coating, whereby the adjacent mixture is not transported via said device. Next, a model of the composite application is built that separates components of the composite application into categories based on the programming language used, and includes metadata to describe interaction between components. The spectrum analyzer resolves the spectral bands and produces information corresponding thereto.