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 twSSaveMem()
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     Save the current screen to a .MEM file. The names of the files
     will be 'SCRNxxx.SCR' 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
     libraries of screens to be predefined and restored when an
     application runs, with the RESTORE FROM then RESTSCREEN commands.
     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 twSsaveMem

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