Unfortunately at the current time we don't have a Yahoo! groups API available. That would be the method for you to access the information that you are looking for.
Thanks Very much. Appreciate the response. So is there any way at all to atleast do the following programmatically: 1) Send email to all members of a yahoo Group. 2) Fetch the list of email IDs subscribed to a Yahoo Group
Those would normally be the functions allotted through a specified API I'm afraid. There isn't one officially available through YDN and I don't know if there is anything that has been reverse engineered by someone else. In searching it looks like there were some questions going around from one of our former YDN'ites about what should be included in a groups API several years ago but from what I can see that development was never made.