Note: Before using the keyboard you must set the focus within the frame by clicking once on the frame.

KeyAction
t
Shift + t
Translate the sentence or paragraph of the current word
c
Shift + c
Copy the sentence or whole paragraph of the current word to clipboard
Right Move to next word
Shift + Right Move to next unknown or learning word (skip known and ignored)
Left Move to previous word
Shift + Left Move to previous unknown or learning word (skip known and ignored)
1-5 Set status(es) to 1 (Learning) to 5 (Learned)
i Mark term(s) as "Ignored"
w Mark term(s) as "Well Known"

You can also "bulk update" statuses by holding down Shift and clicking with the mouse. All of the underlined terms will then be affected when you hit 1,2,...,W.