Need help with Data Presentation Widget selection concepts

[David Pinn]

Let me see if I understand this correctly.

a) The Data Presentation Widgets have two notions of item selection:
the selected item (SI), and the keyboard selected item (KSI).
b) Application code can set the SI via the selection model;
application code cannot set the KSI.
c) You can make the SI a slave of the KSI by setting the keyboard
selection policy to BOUND_TO_SELECTION.
d) The cell with focus is determined by the KSI.

Why the two concepts?

I think this all means that I can't programmatically set the focus on
a particular item in the widget. Is that the case? If so, major
bummer! I'd like my app to set the current row such that subsequent
keyboard events affect that row.