/**
  * <summary>
  *   Retrieves a filesystem for a given identifier.
  * <para>
  *   The identifier can be specified using several formats:
  * </para>
  * <para>
  * </para>
  * <para>
  *   - FunctionLogicalName
  * </para>
  * <para>
  *   - ModuleSerialNumber.FunctionIdentifier
  * </para>
  * <para>
  *   - ModuleSerialNumber.FunctionLogicalName
  * </para>
  * <para>
  *   - ModuleLogicalName.FunctionIdentifier
  * </para>
  * <para>
  *   - ModuleLogicalName.FunctionLogicalName
  * </para>
  * <para>
  * </para>
  * <para>
  *   This function does not require that the filesystem is online at the time
  *   it is invoked. The returned object is nevertheless valid.
  *   Use the method <c>YFiles.isOnline()</c> to test if the filesystem is
  *   indeed online at a given time. In case of ambiguity when looking for
  *   a filesystem by logical name, no error is notified: the first instance
  *   found is returned. The search is performed first by hardware name,
  *   then by logical name.
  * </para>
  * </summary>
  * <param name="func">
  *   a string that uniquely characterizes the filesystem
  * </param>
  * <returns>
  *   a <c>YFiles</c> object allowing you to drive the filesystem.
  * </returns>
  */
 public static YFiles FindFiles(string func)
 {
   YFiles obj;
   obj = (YFiles)YFunction._FindFromCache("Files", func);
   if (obj == null)
   {
     obj = new YFiles(func);
     YFunction._AddToCache("Files", func, obj);
   }
   return obj;
 }