Compile and run-time error messages go to the standard error channel. That means, in interactive graphical mode, that the messages will appear in the terminal window from which Xic was launched. Under Microsoft Windows, if Xic is started from an icon or the Start menu, a terminal window will be created. This window is usually hidden behind the main graphics window, so one should make this window visible when developing scripts. The same applies to the terminal window under Unix/Linux.