Originally Posted by RampantCoyote
Invoke Window?

I do have "Power Word: Defenestrate," which summons a giant window (before shoving an enemy through it),

Ah ha! I knew about PW: Defenestrate, but for some reason I didnīt realize summon window is a part of the spell, and thus thought the need to invoke window in a windowless environment for Defenestrate to work would be quite funny kind of spell synergy.
Since the spell version in place is all-encompassing, forget Invoke Window then .

Originally Posted by RampantCoyote
but that's the only thing that does anything with windows so far…

Blue Screen of Death would be probably pushing it…