code: function() {
  			var keystrokes = this.keystrokeHandler.keystrokes,
  				newKeystrokes = CKEDITOR.tools.isArray( arguments[ 0 ] ) ? arguments[ 0 ] : [ [].slice.call( arguments, 0 ) ],
  				keystroke, behavior;
  
  			for ( var i = newKeystrokes.length; i--; ) {
  				keystroke = newKeystrokes[ i ];
  				behavior = 0;
  
  				// It may be a pair of: [ key, command ]
  				if ( CKEDITOR.tools.isArray( keystroke ) ) {
  					behavior = keystroke[ 1 ];
  					keystroke = keystroke[ 0 ];
  				}
  
  				if ( behavior )
  					keystrokes[ keystroke ] = behavior;
  				else
  					delete keystrokes[ keystroke ];
  			}
  		}
docs: Assigns keystrokes associated to editor commands.
  
  editor.setKeystroke( CKEDITOR.CTRL + 115, 'save' );	// Assigned CTRL+S to "save" command.
  editor.setKeystroke( CKEDITOR.CTRL + 115, false );	// Disabled CTRL+S keystroke assignment.
  editor.setKeystroke( [
  [ CKEDITOR.ALT + 122, false ],
  [ CKEDITOR.CTRL + 121, 'link' ],
  [ CKEDITOR.SHIFT + 120, 'bold' ]
  ] );
  
  This method may be used in the following cases:
  
  * By plugins (like `link` or `basicstyles`) to set their keystrokes when plugins are being loaded.
  * During the runtime to modify existing keystrokes.
  
  The editor handles keystroke configuration in the following order:
  
  1. Plugins use this method to define default keystrokes.
  2. Editor extends default keystrokes with {@link CKEDITOR.config#keystrokes}.
  3. Editor blocks keystrokes defined in {@link CKEDITOR.config#blockedKeystrokes}.
  
  After all, you can still set new keystrokes using this method during the runtime.
  
  @since 4.0
  @param {Number/Array} keystroke Keystroke or an array of keystroke definitions.
  @param {String/Boolean} [behavior] A command to be executed on the keystroke.