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WARNING <message> [HEADER <header>] [WAIT <wait>] ;
               [TOP <top>] [LEFT <left>] ;
               [SHADOW <mshadow>] [FRAME <mframe>]
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Purpose: Displays a string  or an array of strings in a window.
         Various exit methods are allowed. The colour is defined
         in twMsgInit() and the shadow and frame types default to
         those of the currently active window.

         The only difference between this command and INFORM is
         the default colour setting.

Parameters: message  - 'C' String to be displayed. The string can
                           be any length. It is truncated to fit
                           inside the display window.

                     - 'A' Array of strings to be used for
                           messages.  The window is fitted to the
                           maximum length.

            header   - 'C' String to use for the title. In this
                           version, the title is centered on the
                           top line of the window.

            wait     - 'N'  0 - Wait for a key press then restore
                                the underlying screen.

                           -1 - Leave the message on the screen
                                and free the stack allocation
                                space.

                           -2 - Leave the message on the screen but
                                keep it on the stack to be released
                                later with twMsgEnd().

                            n - Wait 'n' seconds or until a key is
                                pressed, then restore the
                                underlying screen.

                                Wait defaults to 0.

            top, left - 'N' Screen Coordinates of top,left corner of
                            the display area. The defaults are to
                            center the window on the screen.

            mshadow   - 'N' TSDWIN shadow type. Defaults to the
                            shadow type for the currently active
                            window.

            mframe    - 'N' TSDWIN frame type. Defaults to the
                            frame type for the currently active
                            window.

Example: WARNING "Message from Header File" ;
                 HEADER "Just Testing" WAIT 2