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Frequently Asked Questions

Notifying applications that the registry has changed

Question:

When I make a change to the registry, some applications do not seem to acknowledge the changes until they are restarted. How can I get the applications to respond to the changes?

Answer:

Broadcast a WM_WININICHANGE message to the system, sending a 
null terminated string detailing the registry section that 
changed. Most well written applications should respond to the 
WM_WININICHANGE message.

Example:

procedure TForm1.Button1Click(Sender: TObject);
begin
  SendMessage(HWND_BROADCAST,
              WM_WININICHANGE,
              0,
              LongInt(PChar('RegistrySection')));
end;

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