Quote Originally Posted by sanahtlig View Post
'Frame' is just a Google Translate-ism. There's really no reason to propagate it as if it was an exact technical term. But yes, this explanation is accurate.
I don't know how this particular translation went down, but frame is probably shortened something equivalent to "framework". Not windows...

It's probably more accurate/appropriate in English to call them A-Class, B-Class, etc., short for "Classification."