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 twWarn( 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.

     The only difference between this function and twInfo() is the
     default colour setting.

       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.