More extensive documentation is now available on-line from Athena. Athena On-Line Help (OLH) is a good starting point for information on all Athena services.
You can also get specific information on Working on Athena and on using Emacs on Athena. There is a user guide for OLTA, the on-line TA question-and-answer queue.
We will use Athena to submit and return homework assignments electronically. For instructions, see http://web.mit.edu/10.10/www/hwutility.html