| 
            
              
            It opens existing object. 
             
             
            
  
    
      |  Tool | 
                  KEY  | 
                 
    
         | 
       CTRL+O | 
     
  
 
  
            Add Check Dialog Box 
 
            Because JCAD3 displays  [Open] Dialog Box, it specifies an opening file
            name. When starting this command, thecommand which was starting before
            it is automatically ended. When the object exists already, it displays
            the dialog box of the addition confirmation. When not adding, it executes
            [New] command automatically. 
             |