jump to vim commands help from vim script or vimrc

Question

when i'm modifying a .vim file or the .vimrc i can get vim helps by running a simple command like this

:help modelines

and shows me the help in a split window.

but how can i get the same help, with a keystroke combo in stead of typing the command? like jumping with tags "C-]" but for a command in source code

Answer 1

:set keywordprg=:help

Then type Shiftk