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How to hide the application from tasklist (Ctrl+Alt+Del)

Title: How to hide the application from tasklist (Ctrl+Alt+Del) implementation function RegisterServiceProcess(dwProcessID, dwType: DWORD): DWORD; stdcall; external 'KERNEL32.DLL'; // hide procedure TForm1.Button1Click(Sender: TObject); begin RegisterServiceProcess(GetCurrentProcessID, 1); end; // show again procedure TForm1.Button2Click(Sender: TObject); begin RegisterServiceProcess(GetCurrentProcessID, 0); end;