Some pop-over dialogs, listed under Secondary windows, can be turned into stand-alone windows and are sometimes described as 'tear-off' windows.
Tearing-off is done by clicking-and-dragging on the margin of a pop-up. After a small distance of drag, the pop-up will change to discrete window.
Tear-off windows have normal window controls and can be closed or minimised like other windows.
The torn-off state does not persist beyond the end of a document session, i.e. when the parent document is closed.