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 twInfo( InMsg, Header, Wait, wT, wL, wSType, wFType )
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     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.

       Arguments:

     InMsg  - '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.

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

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

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

       Return:

     The exit key or 0.

       Example:

     twInfo( "This is a test" )

     Displays "This is a test" in a window centered on the screen in
     the shadow and frame types of the currently active window and
     waits for a keypress to proceed.