5. The AS/400 Toolbox for Java creates threads on behalf of the application to carry out AS/400 Toolbox for Java activity. If the program does not issue System.exit(0) at termination time, the program may not terminate normally. For example, suppose this program was run from a Windows 95 DOS prompt. Without this line, the command prompt would not return when the program finished. The user would have to enter Ctrl-C to get a command prompt.