If the section is longer than the size of your screen, GAP stops after displaying a full screen and displays
-- <space> for more, <q> to quit --
If you press space GAP displays the next full screen of lines of the
section and then stops again.
This goes on until the whole section has been displayed,
at which point GAP will return immediately to the main GAP loop.
Pressing f has the same effect as space.
You can also press b which will scroll back to the previous full screen
of lines of the section.
If you press b when GAP is displaying the top of a section,
GAP will ring the bell.
You can also press q to quit and return immediately back to the main
GAP loop without reading the rest of the section.
The size of the screen is set using information obtained from the
operating system, if possible, or to 24 lines if not.
If this does not produce the correct results for your system,
you may wish to set the number of lines with the -y rows option
(see Command Line Options) when you start GAP.
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GAP 4 manual