QT is an ambiguous term. Usually it refers to the QT Toolkit,
but sometimes it is an abbreviation for QuickTime.
QT Toolkit
The QT Toolkit is a graphical
user interface API published by TrollTech
of Norway.
QuickTime
QuickTime is a multimedia system
published by Apple Computer Corporation. It is favored by the movie industry due
to its superior quality. QuickTime is a trademark of Apple Computer.