Smart Key - Todotext Mode
todotxt-mode is an add-on package for editing todo.txt files using the todotxt-format. For the file format see http://todotxt.org/.
If pressed within a Todotext mode buffer:
ACTION KEY
(1) at the end of buffer, bury the buffer.
(2) on a todo item, toggle the completion status of the todo item
ASSIST KEY
(1) at the end of buffer, archive all completed todo items
(2) on a todo item, edit the item