Here is the swf movies: it shows how to upload EJS jar file (step by step).
Attached file is use to display image in the board list. (check out [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?board=28.0]Collaborative Community of EJS[/url] page ). However, it only works for the first post in the topic. (The first attached image in the first post message, will be displayed in the board list)