7.2.5 ?

(? [command])

Gives one-line usage summary for command. Command may include *s as wildcards; see also (?? ...). One-line command help; lists names only if multiple commands match. ? is a synonym for (help ...)

7.2.54 help

(help [command])

Command may include *s as wildcards; see also (?? ...) One-line command help; lists names only if multiple commands match.