To identify the data items that you want to mark as referenced, build a list of data item names in a buffer. Each name must be 16 bytes long. The names must occupy buffer storage with the first name beginning at buffer offset 0. Your connection must have a registered interest in each name and each name must belong to the storage class that you specify on the STGCLASS keyword.

The system processes only the data items in the list that follow these guidelines. If you include a data item that does not follow these guidelines, the system ignores the data item in the list, but does not indicate which of the data items are ignored when the request completes.

The request must also include the NUMNAMES keyword that specifies the number of names contained in the list of names that you build.