}
"The above word must call the following:"
{ $subsection start-ui }
-"The " { $link ui } " word must not return until the event loop has stopped and the UI has been shut down."
-$nl
-"The event loop must not block, since otherwise other Factor threads and I/O will not run. Instead, it should poll for pending events, then call " { $link ui-wait } "." ;
+"The " { $link ui } " word must not return until the event loop has stopped and the UI has been shut down." ;
ARTICLE: "ui-backend-windows" "UI backend window management"
"The high-level " { $link open-window } " word eventually calls a low-level word which you must implement:"