I wouldn't expect that New Yorker readers know
what Fortran is.
Surprised they didn't just make it Windows.
New Yorker cartoons are supposed to have somewhat obscure humor. If
you get the reference and find it funny you're supposed to feel superior
to those who didn't get it.
There have been New Yorker cartoons that were so obscure that
nobody got them. Not even the editors.
Of course it's also possible to interpret a cartoon too intellectually.
Look at the response to the "Cow Tools" Far Side cartoon for example.
Tim.