title: how to add an icon in the title bar of an SDI App developed using MFC?
body: <p>I have to make changes to an existing Application developed using MFC. this application uses the SDI template with Document\View architecture. I need to place an icon on the window that is being shown at the execution of the Application. At present it does not have any icon to show (some MFC applications by default shows MFC logo). can somebody help me out? I have googled alot but didn't get any success. 
  Also I want to know why do we use IDR_MAINFRAME (same name) for all the resources in the resource.h file. and i have observed its value is fixed at 128.is there any specific reason for this? kindly suggest some good links or books on MFC if u have come across previously?</p>