...check if the Workstation is locked?

function IsWorkstationLocked: Boolean;
var
  hDesktop: HDESK;
begin
  Result := False;
  hDesktop := OpenDesktop('default',
    0, False,
    DESKTOP_SWITCHDESKTOP);
  if hDesktop <> 0 then
  begin
    Result := not SwitchDesktop(hDesktop);
    CloseDesktop(hDesktop);
  end;
end;

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