My basic structure is [discussion about thing], and lo, [example of thing], kind of like I'd pick 1) because the program is. There's a cliche about circus clowns being creepy and dangerous, and lo, last night i saw a clown violating a teddy bear.
LO L O letter logo design. Initial letter LO uppercase monogram logo
According to the oed, in middle english there are two distinct words lo or loo which have fallen together
One of them is indeed derived from a form of look, but the other lá, an exclamation indicating surprise, grief, or joy.
9 lo comes from middle english, where it was a short form of lok, imperative of loken, to look (see etymonline, wiktionary) To behold means to see, to look at and comes from old english bihaldan, give regard to, hold in view (compare to behalten in contemporary german). It expressly calls upon hearers to look at, to take account of, to behold what follows In contemporary english we say “look!” in pretty much exactly the same way.
But i found the structure unusual because lo+adjective itself serves as a noun, which is another grammar in spanish, but the adjective/adverb in the subordinate clause serve as a predicate/adverbial. We have this hungarian phrase állatorvosi ló, which literally translates to veterinarian horse It originated in 19th century hungarian literature, when someone created an illustration of a ho. For my money, log on to a system or log in to a system are interchangeable, and depend on the metaphor you are using (see comment on your post)
I suppose there is a small bit of connotation that log on implies use, and log in implies access or a specific user
