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Reference.org
Windows wait cursor
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<p>The Windows wait cursor, informally the Blue circle of death (known as the hourglass cursor until <a href="/facts/Windows_Vista/IASEUCTB">Windows Vista</a>) is a <a href="/facts/Throbber/Cv6KRsPo">throbber</a> that indicates that an application is busy performing an operation. It can be accompanied by an arrow if the operation is being performed in the background. </p><p>The wait cursor can display on programs using the <a href="/facts/Windows_API/RRw4RtTu">Windows API</a>. </p>