[Jprogramming] Documentation in J REPL

[Y-01]

Hi at everybody

Whether there is a way to find definition of some symbol without switching
to browser.

example:
    help '&'
or
    help 'A.'

and it will print short description (may be with short examples).
mb there is a lib/addon that do it? Does JOD solve this problem?

And what is the usual enviroment for J programming, who use emacs ( besides
j-mode.el )?

Thanks, dear J-s