{
 Retrieves information about the time-out period associated
 with the accessibility features.
 The pvParam parameter must point to an ACCESSTIMEOUT
 structure that receives the information.
 Set the cbSize member of this structure and the
 uiParam parameter to SizeOf(ACCESSTIMEOUT).
}

 // ACCESSTIMEOUT structure
type
  TAccessTimeOut = record
  cbSize: UINT;
  dwFlags: DWORD;
  iTimeOutMSec: DWORD;
  end;
 procedure GetAccessTimeOut(var bTimeOut: Boolean; var bFeedBack: Boolean;
  var iTimeOutTime: Integer);
  // bTimeOut: the time-out period for accessibility features.
 // bFeedBack: the operating system plays a descending
 // siren sound when the time-out period elapses and the
 // Accessibility features are turned off.
 // iTimeOutTime: Timeout in ms
var
  AccessTimeOut: TAccessTimeOut;
 begin
  ZeroMemory(@AccessTimeOut, SizeOf(TAccessTimeOut));
  AccessTimeOut.cbSize := SizeOf(TAccessTimeOut);
  SystemParametersInfo(SPI_GETACCESSTIMEOUT, SizeOf(AccessTimeOut), @AccessTimeOut, 0);
  bTimeOut := (AccessTimeOut.dwFlags and ATF_TIMEOUTON) = ATF_TIMEOUTON;
  bFeedBack := (AccessTimeOut.dwFlags and ATF_ONOFFFEEDBACK) = ATF_ONOFFFEEDBACK;
  iTimeOutTime := AccessTimeOut.iTimeOutMSec;
 end;
 // Test it:
procedure TForm1.Button2Click(Sender: TObject);
 var
  bTimeOut, bFeedBack: Boolean;
  iTimeOutTime: Integer;
 begin
  GetAccessTimeOut(bTimeOut, bFeedBack, iTimeOutTime);
  label1.Caption := IntToStr(Ord(bTimeOut));
  Label2.Caption := IntToStr(Ord(bFeedBack));
  Label3.Caption := IntToStr(iTimeOutTime);
 end;
 {
 Sets the time-out period associated with the accessibility features.
 The pvParam parameter must point to anACCESSTIMEOUT structure that
 contains the new parameters.
 Set the cbSize member of this structure and the uiParam
 parameter to sizeof(ACCESSTIMEOUT).
}
 {
 Setzt Informationen zu den ACCESSEDTIMEOUT-Eigenschaften.
 "uiParam" erwartet die Gro?e der ACCESSEDTIMEOUT-Struktur,
 die in "pvParam" ubergeben werden muss.
}
 procedure SetAccessTimeOut(bTimeOut, bFeedBack: Boolean; iTimeOutTime: Integer);
  // bTimeOut: If true, a time-out period has been set for accessibility features.
 // bFeedBack: If true, the operating system plays a descending
 // siren sound when the time-out period elapses and the
 // accessibility features are turned off.
 // iTimeOutTime: Timeout in ms
var
  AccessTimeOut: TAccessTimeOut;
 begin
  ZeroMemory(@AccessTimeOut, SizeOf(TAccessTimeOut));
  AccessTimeOut.cbSize := SizeOf(TAccessTimeOut);
  case bTimeOut of
  True: AccessTimeOut.dwFlags := ATF_TIMEOUTON;
  False: AccessTimeOut.dwFlags := 0;
  end;
  if bFeedBack then
  AccessTimeOut.dwFlags := AccessTimeOut.dwFlags or ATF_ONOFFFEEDBACK;
  AccessTimeOut.iTimeOutMSec := iTimeOutTime;
  SystemParametersInfo(SPI_SETACCESSTIMEOUT, SizeOf(AccessTimeOut),
  @AccessTimeOut, SPIF_UPDATEINIFILE or SPIF_SENDWININICHANGE);
 end;
 // Test it:
procedure TForm1.Button1Click(Sender: TObject);
 begin
  SetAccessTimeOut(True, True, 600000); // 10 min. timeout
end;