?
The help command ? followed by no section name redisplays the last help
section again. So if you reach the bottom of a long help section and
already forgot what was mentioned at the beginning, or, for example, the
examples do not seem to agree with your interpretation of the
explanations, use ? to read the whole section again from the beginning.
When ? is used before any section has been read GAP displays the
section Welcome to GAP.
GAP 3.4.4