A Boolean input port whose key is inputPreviewMode. When the value of this input port is set to TRUE, the composition that provides this port must be able to run in a low-quality mode that produces a preview of the composition.
Available in Mac OS X v10.5 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)