Since XP, when an application froze the window itself would render in spite of the frozen/omitted contents. So when the titlebar got an ending "(not responding)

Since XP, when an application froze the window itself would render in spite of the frozen/omitted contents. So when the titlebar got an ending "(not responding)" tag it is easily closed with one click of the close button, then another of "end now" as confirmation. And there's always alt-f4.