In animation, the basic unit of time measurement.
The duration of an animation is changed by increasing or decreasing
its frame range. Typically, 30 frames
of animation correspond to one second on NTSC video tape (25 frames
for PAL video tape, and 24 frames for film).
In MEL animation expressions, an internal
variable that returns the current frame position along the timeline.
This variable can be used in the Attribute Editor to
go to the current frame.
