Detecting if the inventory is visible?

[Emera]

I feel really silly for asking something like this, but I've done some digging and I can't find anything! Is there a way to detect if the default inventory is visible? I've scanned through first responders and such, and it doesn't show up as one, and I can't find any functions related to hiding it on the forums/on the wiki/using /scripthelp in RC. Does anybody know if it's actually possible?