[orca-list] Redrawing of visible screen?

[hermann <steppenwolf2 onlinehome de>]

Hi all,
in the hotkeys list of Orca there's a keystroke OrcaKey+Numlock, which
should redraw the visible screen.
Two questions:
1. What is it for?
2. Why doesn't it work? Pressing this combination I turn on Numlock and
nothing happens.
Perhaps it has been changed or turned off.
Regards
Hermann