@WINOWNER — Searches for
a window, and returns its owner window’s handle.
Syntax:
%@WINOWNER[window,flags]
| window | window title, program name, PID, or HWND |
| flags | bitmapped: |
| 1: return window handle in hexadecimal |
If no matching window is found, the return value will be 0.
See also: @WINPARENT.