Hi all, I am trying to build a demo application for the research libraries we have created at my work place. Uptil now, we have been using these libraries from the command line, and we would like to show a simple gui-based demo application to show the functionality. I want the following features in the demo application: 1. multiple document support - to open multiple images 2. loading bmp images and showing them in the document window 3. working with image layers to show overlay information on top of the loaded image can you please give me references for material on how to build an imaging tool using mfc and especially on implementing multiple layers. thanks in advance! siddharth