 Usage:  output (fname, option)  
 
 Input:

  fname                  string, name of the file which should be used 
                         
  option                 string, defines the operation 
                         &val; "reset" 
                         &means; file will be generated or overwritten respectively, 
                         &val; "append" 
                         &means; output will be appended or generated, 
                         &val; "close" 
                         &means; file is closed, 
                         
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(C) MD*TECH Method and Data Technologies, 17.8.2000
