NeXT had X buttons to close windows before windows 95, with a very similar look to to win 95 window button styles too. I think NeXTStep 1.0 was in 1989 or there

NeXT had X buttons to close windows before windows 95, with a very similar look to to win 95 window button styles too. I think NeXTStep 1.0 was in 1989 or thereabouts.