CAS helps creating index prints of your digital photos and images. Just drag and drop a folder onto CAS, or run it with a command-line parameter to generate a contact sheet of images in that directory. This is a new jpg file which contains thumbnails of each of the jpg, gif and bmp images found in that folder. You can see a sample of the output. The background colour can be changed, as can the size of the contact sheet which is created. You may also just run cas.exe where it is, and you will be asked for the location of a directory you would like to index.