shr und ^. Was heißt das?

[Koller]

hab folgende procedure

Delphi-Quellcode:

procedure Decode(Source, Target: pointer; Count: longword);
var
   S: PDWORD;
   T: PByte;
   I: longword;
begin
   S := Source;
   T := Target;
   for I := 1 to Count do begin
      T^ := S^ and $ff;
      inc(T);
      T^ := (S^ shr 8) and $ff;
      inc(T);
      T^ := (S^ shr 16) and $ff;
      inc(T);
      T^ := (S^ shr 24) and $ff;
      inc(T);
      inc(S);
   end;
end;

Wozu sind die befehle shr und ^ da?