Quoting Steve Litt (slitt@???):

> You just said it in the first sentence of the preceding paragraph: Why
> not substitute the phrase "grapical environment" for "session"?

Um, how about because that would be factually mistaken?

It would be an excellent idea if you were to poke around SLiM and some
of the Web pages and documentation about it.

Or, alternatively, you might prefer a different X11 Display Manager
whose design you prefer. There have always been a lot of them. Even
then, though, I would strongly recommend spending some time getting to
better know X11's admittedly labyrynthine design and file layout.