ocr: Messages Messages The New window procedureis inserted into the nessage. chain so that it gets to POcess messages tirst. Onginal window Procedure: New: window Procedure After being, processed by the new window procedure, messages are: then passed along! to the original window procedure. Original Window Procodure Figure 2: The first window procedure in a chain con process a nessuge completely or partially, oritcan ignore it altogether.