GDDM V3R2 Diagnosis
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Function

GDDM V3R2 Diagnosis
SC33-0870-01
This control block contains fields and flags for handling I/O operations with the device. It contains various buffer addresses and lengths, and fields that show the state of the I/O.
It is a part of the Terminal Services Interface Control Area (TCA). All offsets defined below are from the start of the TCA.

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