HEIDENHAIN iTNC 530 (340 422) ISO programming - Manual (Page 544)

544 14 iTNC 530 with Windows 2000 (Option)
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Shutting down Windows
If you try to shut down Windows while the iTNC software is still active,
the control displays a warning (see figure at top right).
If you confirm with OK, the iTNC software is exited and Windows is
shut down.
Caution!
Before you confirm with OK, you absolutely must press
the Emergency Stop button. Otherwise you could lose
data or the machine could become damaged.
Caution!
After several seconds Windows displays its own warning,
covering the iTNC warning (see figure at center right).
Never confirm the warning with End Now, since you could
lose data or the machine could become damaged.