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For this purpose it is necessary to change the type of the created form in the FormCreate handler (if windows have WS_EX_TOOLWINDOW style, then these windows are not displayed on Task Bar) and create handler for the FormClose event for preventing closing the window.
procedure TForm1.FormCreate(Sender: TObject); begin SetWindowLong(Application.Handle,GWL_EXSTYLE,WS_EX_TOOLWINDOW); end; procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction); begin Action:=caNone; Form1.Hide; end;
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