Hello,

If you don't want to use my component TYRPasswd, you are still
able to use directly the DLL called PASSWORD.DLL . The way to 
proceed is the following :

1) Put the files PASSWORD.DLL and PASSWORD.INI in the directory
   of your application (or in the windows/system directory if you
   want to protect several applications with the same password).

2) In the main form of your application, do the following :

   unit Maindemo;

   interface

   uses
     SysUtils, WinTypes, Messages, Classes, Graphics, Controls,
     Forms, Dialogs, StdCtrls, FileCtrl, Buttons;

   type
     ...

   var	
     ...
   
   {------------------------- HERE ----------------------------}
   const	
     PasswordLoaded : Boolean = False; { Presume nothing! }

   var
     Login: function(var UserN : String ; var PriorityL : Integer ;
                     IniFileName,SectionName : String) : WordBool ; { <--- THE BOOLEAN FUNCTION }

     UserName  : String ;
     UserLevel : Integer ;

   implementation

   {$R *.DFM}

   {$IFDEF WINDOWS}
   uses WinProcs;
   Const SEM_NoOpenFileErrorBox = $8000;
   {$ELSE}
   uses WinAPI;
   {$ENDIF}

   var SaveExit: pointer;
       DLLHandle: Word;

   procedure NewExit; far;
   begin
     ExitProc := SaveExit;
     FreeLibrary(DLLHandle)
   end {NewExit};

   procedure TDemoForm.FormCreate(Sender: TObject);
   begin
     {$IFDEF WINDOWS}
     SetErrorMode(SEM_NoOpenFileErrorBox);
     {$ENDIF}
     DLLHandle := LoadLibrary('PASSWORD.DLL');
     If DLLHandle >= 32 then { Succes }
     Begin
       PasswordLoaded := True;
       SaveExit	      := ExitProc;
       ExitProc	      := @NewExit;
       @Login         := GetProcAddress(DLLHandle,'MOTDEPASSE');
       If not Login(UserName,UserLevel,'password.ini','Users')
  	 then Application.Terminate
  	 else Begin
		{ initialization }
		Color := clGreen ; { Just for the DEMO }
	      End ;	
     End else
     Begin
       MessageDlg('Fichier PASSWORD.DLL introuvable!', mtInformation,[mbOk], 0) ;
       Application.Terminate ;
     End ;
   end;

   {------------------------- HERE ----------------------------}
   ...

   end.