GAP Manual: 3.9. Redisplaying a Section

?

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.