hwndActiveWindow (HWND)

The handle of the window to be made active.

Its window procedure receives all messages from the Help Manager until the application changes the active window with another HM_SET_ACTIVE_WINDOW message.

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.

rc (ULONG)

Return code.
• The procedure has been successfully completed. Other
  See the values of the ulErrorCode parameter of the HM_ERROR message.

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