Evoking the option for :help in a mapping

I have the customary mappings for :help,

    nmap <F1> :exec "help " . expand("<cword>")<CR>
    nmap <S-F1> :exec "help " . expand("<cWORD>")<CR>

and have been trying to develop similar do the <Tab> option on the cursor word, something like

    nmap \\ yiw:h ^R"^[

but to no avail.  Although the mapping does not terminate with a <CR>, vim treats the ^[ as if it were <CR> rather than <Tab> and goes straight to the specific help for the cursor-word.

Is it possible to have vim act on the <Tab> as it does in the command line?

--

Graham Lawrence

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