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unit Unit1;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, unit2;

type
  TForm1 = class(TForm)
    ComboBox1: TComboBox;
    procedure ComboBox1Change(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.ComboBox1Change(Sender: TObject);
begin
if combobox1.text='abc' then xx1;
if combobox1.text='def' then xx2;
end;

end.					

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unit Unit2;

interface
procedure xx1;



implementation
procedure xx1;
begin
label1.caption:='xxxc';
end;
end.					

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unit Unit3;

interface
procedure xx2;
implementation

procedure xx2;
begin
label1.caption:='xxxd';
end;
end.					

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unit Unit2; 

uses
  Unit1;

interface 

procedure xx1; 

implementation 

procedure xx1; 
begin 
  Form1.label1.caption:='xxxc'; 
end;

end.