ACUCOBOL-GT comes with a sample program called "MESSAGE". This program provides basic message-box support. A message box is a simple pop-up window that provides information to the user. In some instances, it accepts a response (such as Yes or No) from the user.
The "MESSAGE" program calls the host operating system's message box handler when one is available. Therefore, if "MESSAGE" is called when the program is running under Windows, the program gets a native Windows message box. When the same program runs in a text-mode environment, the runtime provides a simulated, character-based message box.
The "MESSAGE" program comes in source form and can be found in the "sample" subdirectory or your ACUCOBOL-GT installation directory. Please see the comments in the program for additional details.