title: batch file which asks for username/password + registration
body: <p>I would like a batch file that can register a user into itself.
  something like:</p>
  
  <pre><code>@echo off
  echo Choose an option:
  echo     1:Register
  echo     2:Login
  Set option=
  set /p option=Your option: 
  if %option%==1 goto reg
  if %option%==2 goto login
  ...
  :reg
  --The registration script--
  goto login
  ...
  :login
  Set usr=
  set /p usr=Username: 
  if %usr%== goto pass
  echo False username!
  @pause
  goto login
  ...
  :pass
  Set passw=
  set /p passw=Password: 
  if %passw%== goto success
  echo False password!
  @pause
  goto login
  </code></pre>
  
  <p>So... something like that. 'if %passw%== ""  and if %usr%== ""'  === it should automatticly make that at registration.</p>
  
  <p>It will be nice if more than 1 people could register.</p>