Whether the manual holds nothing at all, so no answer of it means "undocumented".
StaticfromThe manual of the package installed at dir (the installation directory, holding its DESCRIPTION), from its help/AnIndex: aliases only, as an installed package ships no man/.
Adds the alias -> topic pairs of an installed package's help/AnIndex, which lists no page content.
Adds the pages of an installed package's Meta/Rd.rds, which states aliases and titles but no content.
Adds the topic -> title entries of an INDEX or demo/00Index; such a table states no aliases.
Whether any page documents name (see topicOf for what counts).
The parsed page of topic, undefined when only its aliases are known (an AnIndex without man/).
The one-line title of topic, undefined when no source that stated the topic also stated one.
The page documenting name, resolved as R's help system does: own alias first, then the fallbacks that let a name share a page (replacement, S4 method, S3 generic; longest generic first).
Every topic (page name) the manual knows, in insertion order.
The manual of a package: its RdPages plus the alias-to-topic mapping they (or an installed package's
help/AnIndex) state. See RdIndex.topicOf and RdIndex.documents.