Explain that it is sent to the active TLW and not the focus window and that handling it suppresses all the normal keyboard events. Mention that it is not generated by wxOSX/Cocoa currently, see #12431. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67190 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775