> map  <F2>  :let w="<cword>"<CR>:top new "help"<CR>:1! perldoc -t w<CR>

You're looking for something like

map <F2> :let w = expand('<cword>')
     \ <bar>exe 'top new '.w
     \ <bar>setl bt=nofile noswf
     \ <bar>0put=system('perldoc -tf '.w)
     \ <bar>1<cr>

but this has lots of problems.  Surely one of the scripts at
http://www.vim.org/scripts/ does what you want with more
functionality.  Search for perldoc.

Regards, John

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