title: Getting a permanent access token for facebook application with credentials
body: <p>Can i get a permanent access token for my facebook application , using user's credentials (email, password). 
  As i have seen in many application like yahoo messenger ,windows live , nimbuzz for mobile 
  and other, they just ask for username and password ,
  and they got added in my apps,
  So pls tell me , how can i get it done....
  i want to create a desktop application in which i will take users credentials and 
  in my desktop application ,
  i will take users action to get it done on his wall....
  Pls help</p>