code: function use(fullQualifiedClassName) {
  	var container = use.getContainer(fullQualifiedClassName)
  	;
  	
  	if (container._loader === null) {
  		use.loadCount++;
  		container._loader = Ajax.factory(
  			"get", container._path + use.fileExtension
  		);
  		container._loader.addEventListener(Ajax.Event.LOAD, function(event) {
  			var  domains
  				, className
  			;
  			use.loadCount--;
  			// Load into script ram
  			container._class = new Function(event.detail.responseText);
  			// Import into context
  			domains = fullQualifiedClassName.split(use.classPathDelimiter);
  			className = domains.pop();
  			
  			namespace(domains.join(use.classPathDelimiter), function() {
  				var contextBackup = null
  					, property
  				;
  				// Save old class name
  				if(this.hasOwnProperty(className)) {
  					contextBackup = this[className];
  				}
  				// Run loaded code
  				container._class.call(this);
  				
  				// Restore backup
  				if (contextBackup === null) return;
  				if (this[className] !== contextBackup) {
  					for(property in contextBackup) {
  						if(property == className) continue;
  						if(this[className].hasOwnProperty(property)) {
  							throw new Error(
  								"CoreJs: "
  								+ "Overlapping namespace with class "
  								+ "property '"
  								+ fullQualifiedClassName +"."+property
  								+"' detected."
  							);
  						} else {
  							this[className][property] = contextBackup[property];
  						}
  					}
  				}
  			});
  		});
  		container._loader.addEventListener(
  			Ajax.Event.LOAD, namespace.handleEvent
  		);
  		container._loader.load();
  	}
  }
docs: Auto load system.
  
  @signleton