twSSaveAsc()
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     Save the current screen to an ASCII file. The names of the files
     will be 'SCRNxxx.TXT' where xxx is a number incremented as screens
     are saved DURING THE CURRENT SESSION. There is not, at present,
     the option to define the filename to which the screens are to be
     saved.

     It is suggested that this function is useful in developing
     illustrations for written manuals. The function can be defined
     with a SET KEY, called when needed and commented out when it is
     time to deliver the application.

       Arguments:

     None.

       Return:

     Current window handle.

       Example:

     SET KEY 287 TO twSsaveAsc

     Sets the ALT-S key to save screens to ASCII files.