Send request to add application in Face Book using Rails

Does any one know how to send a request to friends to add an application using Rails and Face Book API methods. The result should that a application request comes under the Request header on left hand side in Face Book home page of the friend. Can some one give some guidance on this. Do we use facebook.notifications.sendRequest method of Face Book API? or something other way?

Thanks and Regards
Arjun Ghosh