TN.130.ioCompletion - When making synchronous calls to the File Manager, it is not necessary to clear ioCompletion field of the parameter block, since that is done for you. Some earlier technotes explicitly cleared ioCompletion, with the knowledge that this was unnecessary, to try to encourage developers to fill in all fields of parameter blocks as indicated in Inside Macintosh. By the way, this is true of all parameter calls—you only have to set fields that are explicitly required.
