Kako koristiti Turtle Graphics?

[ query @ 08.05.2005. 09:57 ] @

Treba da uradim par zadataka i ako koristim npr. funkcije Forwrd, TurnRight kaze da ih ne prepoznaje.
Dali moram ovdje da nesto instaliram?
npr.

Code:
procedure Boom (iDiepte: Integer; fLengte, fFactor: Extended;
                iHoek: Integer);
begin
  if iDiepte > 0
  then begin
    Forwrd (fLengte);
    TurnLeft (iHoek);
    Boom (iDiepte – 1, fLengte * fFactor, fFactor, iHoek);
    TurnRight (2 * iHoek);
    Boom (iDiepte – 1, fLengte * fFactor, fFactor, iHoek);
    TurnLeft (iHoek);
    Back (fLengte)
  end
end;

Error:

[Error] untBoom.pas(12): Undeclared identifier: 'Forwrd'
[Error] untBoom.pas(13): Undeclared identifier: 'TurnLeft'
[Error] untBoom.pas(14): Illegal character in input file: '–' ($96)
[Error] untBoom.pas(15): Undeclared identifier: 'TurnRight'
[Error] untBoom.pas(16): Illegal character in input file: '–' ($96)
[Error] untBoom.pas(18): Undeclared identifier: 'Back'