As long as you can, avoid "using" the mouse. Always try to find out the keyboard shortcuts for operations and instead of sending mouse events, send the keyboard equivalents. That will spare you endless tweaking of coordinates and hassle with windows sitting on a different desktop or having weird coordinates/offsets because some system setting changed the window border to be thicker.

To call up a menu, send ALT- combinations and then either cursor keys to navigate in the menu or directly the hotkey. Navigation in dialogs is best done using TAB for setting the focus and space to toggle selections.

Checking whether a window has gone away is likely best done by checking whether there is still a window with the handle open.

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