System Delphi

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function CtrlDown: Boolean;
var
State: TKeyboardState;
begin
GetKeyboardState(State);
Result := ((State[VK_CONTROL] and 128) <> 0);
end;
function ShiftDown: Boolean;
var
State: TKeyboardState;
begin
GetKeyboardState(State);
Result := ((State[VK_SHIFT] and 128) <> 0);
end;
function AltDown: Boolean;
var
State: TKeyboardState;
begin
GetKeyboardState(State);
Result := ((State[VK_MENU] and 128) <> 0);
end;