A ClearWin window (no '+') refers to a window created to contain output that would have gone to the screen if the program were not a Windows application. The name refers to the fact that the original ClearWin only created such relatively primitive windows. A ClearWin window is still useful for debugging purposes, and may be properly embedded in a format window using %cw. Keyboard input can also be taken from a ClearWin window, but this is not recommended in finished programs.