If you want personal chat with a friend, you don't need to download any yahoo messenger, All you need is your friends IP address and Command Prompt.Firstly, open Notepad and enter:@echo off:AClsecho MESSENGERset/p n=User:set/p m=Message:net send%n%%m%PauseGoto ANow save this as "Messenger.bat".Open the .bat file and in Command Prompt and after opening..... you should see:MESSENGERUser:After "User" type the IP address of the computer you want to contact.After this, you should see...