J language help

J installed on your machine includes complete help relevant to that release. J help has release notes, reference books such as the Dictionary and User Manual, three books on J language programming, and more.

J help is also here for the latest stable release, unless the beta release is nearly ready in which case it will be for the latest beta version.

J database help

Jd addon installed on your machine includes complete help relevant to that release.

Jd help is also here for the latest stable release.