[BRLTTY] Moving to the side by the size of the display

[timothyhobbs at seznam.cz]

Hello,

I am again trying to learn to use BRLTTY. I have my hand made braille 
display, but it has no navigation keys and only displays 12 characters. 
Looking at the keyboard keybindings for brltty http://www.mielke.cc/brltty/
doc/KeyBindings/kbd-desktop.html I see no way to move horizontally by the 
size of the display. So how can I read what is on the screen?

Thanks,
Tim
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