M-x cperldoc-mode
Then enter the keyword you are using, best kept in a separate buffer or of course you could use perldoc on the command-line.
Update LanX below is correct, (a while since I used emacs...vi...editor v's OS...flame war)
M-x cperl-perldoc was what I meant and perl-perldoc-at-point was what you meant
There is no cperldoc-mode in the web, did you mean perldoc.el ?
Or do you mean:
cperl-perldoc or cperl-perldoc-at-point¹ ?
(I occasionally use M-x woman)
I suppose the benefit from info-files comes from better highlighting, being able to navigate with hyperlinks and using a search over all documents, I'm afraid cperl-perldoc can't do this.
Cheers Rolf
UPDATES/FOOTNOTES:
(1) They work fine, but like always the keybindings are ridiculously long C-c C-h p or C-c C-h P, thankfully they can be redefined...
REPLY TO YOUR UPDATE:
> perl-perldoc-at-point was what you meant
No, cperl-info-on-command and cperl-info-on-current-command was what I meant. 8)
and cperl-perldoc-at-point was what you meant! ;-)