https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.control.queryaccessibilityhelp?view=netframework-4.8.1&redirectedfrom=MSDN
Control.QueryAccessibilityHelp Event (System.Windows.Forms) | Microsoft Learn
Occurs when AccessibleObject is providing help to accessibility applications.
event systemwindows formscontrolmicrosoftlearn