I mean, I'm pretty sure for me that while Ni can go anywhere it wants, by itself--if such a thing could exist--it'd be a huge undifferentiated mess, and since Se, for me, is inferior, that kind of awareness of what's out there right now exists even while I'm busy with Ni. Obviously, while I'm busy with Ni, Se does not exist as a current, conscious input stream, but I'm pretty sure it remains present as a nuance to every vision available to Ni. I suspect my consciousness will reject a dream of the world if goes too far away from remembering that there are immediate senses. (Consciousness for me is of course dominated by Ni, so it can go pretty far into forgetting there are immediate senses, but still....)
But when I said Te keeps it "real", I meant more that whatever goes on in Ni, it has to obey at least some kind of logic of "things out there". It may make up that logic, varying it considerably from what is currently the case in the real world, but it'll still be some kind of logic of "things out there"--mechanisms, processes, things and objects and so on. And I think, if I'm not just dreaming and noodling away the afternoon, then awareness of Se is going to get a look in too. Not Se itself, but Ni being aware that "people" use Se to get by. (Ni would be aware because, I guess, Te is on hand saying so, drawing on too many years of being me to prove it, I guess.) (And naturally, when I say "people", I mean me, and when I say Se, I mean inferior Se.)
I assume this is logical, but I don't know exactly if it is real, for the true influence of Se on my perceptions and thinking is child-like and probably much more subconscious than not. However, I like the idea. After all, the inferior has to be good for something, yeah?