This is the info-lookup-symbol bit I've been using which I mentioned.
;; ucblogo.info has index entries for the infix operators * + - / = < <= <>
;; > >= so match those in the :regexp pattern too
(eval-after-load "info-look"
'(info-lookup-maybe-add-help
:mode 'logo-mode
:topic 'symbol
:ignore-case t
:regexp "[a-zA-Z.][_a-zA-Z0-9.]*\\|[*+-/=`]\\|<[=>]?\\|>=?"
:doc-spec '(("(ucblogo)INDEX"
nil
"[_a-zA-Z0-9.*+-/<>=`]+"))))
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