1) The document describes steps for listening to music on an application and sending tweets about the music from within the application using a Twitter menu option. 2) It involves clicking the Twitter menu on the music player, entering a private message about the song, and sending a tweet with a link to the song and the message tagged with #mnet. 3) Users must have a Twitter account and be logged in via the application in order to send tweets, as the application only facilitates sending tweets and does not display the tweets itself.