Assuming that you arte using Cocoa, by default, the icon that you see in the dock is the applications icon. Just create an icns file, include it with your project and in Application Settings under Target put in the name of your icon file. If you are talking about changin the application icon while the program is running, like Interface Builder and Mail do, Then you'll want to use - (void)setApplicationIconImage

NSImage *)anImage in NSApplication.
[This message has been edited by Dalgo (edited 01-29-2001).]