hwndRelativeWindow (HWND)

The handle of the window next to which the help window is to be positioned.

The handle of the application window next to which the Help Manager will position a new help window.

HWND_PARENT

This Help Manager defined constant tells the Help Manager to trace the parent chain of the window that had the focus when the user requested help.
Other
Handle of the window next to which the help window is to be positioned.

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