Advantech-DLoG DLT-V7210KD User Manual page 85

General Device Configuration
Device shut down
If the operating system is shut down, all applications will be notified via the Windows
message "WM_QUERYENDSESSION" first.
Every application must then respond within the time set in the registry. If there is no
response within the preset time, the application will be hard-terminated.
It may not be possible to close an application automatically if it has unsaved data.
Example: For example, the „WORDPAD.EXE" program (included in Windows) cannot be
closed automatically if there are unsaved changes. In such a situation,
„WORDPAD.EXE" will acknowledge the "WM_QUERYENDSESSION" Windows
message by prompting the user to choose whether to save or not.
All applications that can be terminated without user confirmation using the keyboard
shortcut ALT + F4 will normally also respond correctly to the
"WM_QUERYENDSESSION" message and therefore do not need to be hard-
terminated.
To ensure that important data is saved correctly, the application must respond
appropriately to "WM_QUERYENDSESSION", i.e. the backup data must be saved
without user confirmation and within the preset time.
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