The frame displaying the poem consists of a one column showing the lines of the poem. Also there are two columns to the left of line (one with a "v" and one with a line number.) Additionally, there are 5 columns to the right of the line available for linking to notes of various types.
Words in the line of the poem that have just the first letter linked will link to a defintion of the word. Words are phrases that are linked will link to an explanation, translation or observation about the word or phrase.
Selecting the line number should bring that line to the top of the display. Selecting the "v" should bring the line 5 lines before the line with the "v" to the top of the display (effectively moving the selected line down some.) This allows you to view the preceeding content without having to scroll.
To the right of the poem lines will be links of various types.