The Global Information Segment (GISEG) is a single instance control block that records the current session status, date and time, trace status and version of the system.

The system maintains two copies of the Global Information Segment to fence against system damage.

The selector for the GISEG may be located from the SAS. See the Dump Formatter and Kernel Debugger .A command.

The GISEG is also mapped locally per-process by LDT descriptor 0xdff4.

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