Hi

This yahoo messenger clone uses the YMSG protocol to connect to the yahoo messenger server. This clone can retrieve the friends list from the server and u can also send and receive messages using this clone.You will need a dll "venky.dll" to do the encryption for ur yahoo password.You can find it at http://www.venkydude.com/articles/yahoo.htm 
.You can also learn abt the YMSG protocol by going to the above page.

venky

http://www.venkydude.com