IEHINITT supports the use of uncaptured UCB addresses. Capturing and uncapturing is a process used by the operating system to convert 31 bit, above the 16 MB line addresses into 24 bit, below the line addresses. There are no special considerations that need to be made by the user if devices are allocated via JCL, the normal method of invoking IEHINITT. However, user written applications can dynamically allocate devices without capturing them and pass them to IEHINITT. IEHINITT sets return codes in register 15.

Related reading: For information about the IEHINITT return codes, see Invoking Utility Programs from an Application Program.