(And maybe your front porch, depending on how much of it is fully occluded behind the pane).
Of course, it'll also remove all other objects, trees, and clouds, leaving nothing but empty land as far as the eye can see. Don't like your view? One too many giant, spinning "For Sale" signs on the horizon? Slip an invisiprim behind your windows (remember, you only need to use the invisiprim texture on the side you're seeing- you can texture the outside view however you like), and remove the offending portion of the grid from your sight. But I can see this being useful for dealing with the eyesores that may appear on the grid from time to time. So you'll seldom see this effect by accident. In practice, most invisiprims are small, generally no bigger than is needed to hide legs or feet for exotic avatars and high-heeled shoes. So what? Well, it's mostly just an oddity. So parts of an opaque object may disappear, while other parts remain. (Naturally, alpha/transparent objects behaved as expected, with portions of a prim disappearing behind the invisiprim.) Occlusion appears to work on a prim level, not an object level. So, fully opaque objects that are only partway inside the occluded field of view are still fully visible. Prims apparently cannot be partially occluded (this is possibly common knowledge, I just never really thought about it). The only thing remaining in the middle-to-far view was land and sky. This included local walls (I was inside a building at the time), floors, furniture, and so on. Far away objects (further than 10 meters or so) completely failed to render.
I observed the same results from multiple locations behind the pane. The occluded field of view is just a sample. Last night, I made a simple test case using a large (10x10x0.1) invisiprim. Large, fully opaque objects behind the avatar suddenly disappeared! But the reasons behind it only clicked in my mind a couple nights ago. I'd noticed this effect before, when placing my camera very close to an avatar that incorporated a large invisiprim. (If that doesn't make sense, I'd recommend following one of the links above and playing with an invisiprim yourself. So, under a limited set of circumstances, the invisiprim will hide solid, opaque objects, as well as objects with transparency/alpha masks. The net result is the objects that are fully occluded behind an invisiprim are not rendered, just as if they were behind a solid wall. Apparently, the texture used for the invisiprim trick is treated as opaque for purposes of occlusion calculations. The old "invisiprim" (which can be found here or here) interacts rather interestingly with the (relatively) new object-object occlusion filter. Worked out something kind of interesting a couple days ago.
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