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The DIAGNOSE privilege lets a process run online diagnostic programs and intercept and copy all messages written to the error log file.

The DIAGNOSE privilege also lets the process perform the following tasks:

Task Interface
Issue a $QIO request with associated diagnostic buffer $QIO
Modify the number of interlocked queue retries $QIO request to an Ethernet 802 driver (DEBNA/NI)
Set the spin-wait time on the port command register $QIO request to an Ethernet 802 driver (DEBNA)
Access the Diagnostic and Utilities Protocol (DUP) class driver $QIO request to the SCSI driver (GKDRIVER)
Process a diagnostic buffer $QUI request to a TU58 magnetic tape (TUDRIVER)