wn_sync -- set/clear cursor synchronization flag

        USAGE

          wn_sync(wn, flag)
          WINDOWPTR wn;
          int flag;

                wn -   window handle
                flag - synchronization flag (TRUE or FALSE)

          When wn_sync is called with a value of TRUE all subsequent text
          output to the window will have a flashing (normal) cursor
          displayed following the last character output. Calling wn_sync
          with a value of false inhibits the cursor from physically
          advancing (it is always logically advanced).

        RETURNS

          Nothing.

        CAUTIONS

          None.