What is a tag line and tag action in a dramatic greek play

http://books.google.com/books?id=fL7uAvJYBzoC&pg=PA166&lpg=PA166&dq=tag+line+action+in+greek+play&source=bl&ots=uZN0_RJpZU&sig=nuYScHpeFzkL-Bd_Ria6wRy4qV0&hl=en&ei=gWTCSpCnJdOOtge5wd3kBA&sa=X&oi=book_result&ct=result&resnum=1#v=onepage&q=&f=false

Note the first part of the paragraph beginning with these words: "The play ends with lines..."