User`s guide

18 Introduction
If the current page or portion of the page is longer than the
screen display or window in which it is displayed, local keystrokes
can be used to “pan” the window up or down (Ctrl-↑ and Ctrl-↓).
As a window is panned up, the page appears to be moving down;
the opposite is true when panning the window down. Text that
is panned off the screen is out of view, but is not lost.
The figure below represents the display screen with a 48 line
page length on a 44 line screen, after panning the window down
2 lines.