ActionScript for Flash MX: The Definitive Guide, 2nd Edition By Colin Moock
Chapter 18. ActionScript Language Reference
nextFrame( ) Global Function
Flash 2
advance a movie or movie clip's playhead one frame and stop it
nextFrame()
Description
The nextFrame( ) function moves the playhead of the current timeline ahead one frame and stops it there. The current timeline is the timeline from which the nextFrame( ) function is invoked. The nextFrame( ) function is synonymous with gotoAndStop(_currentFrame + 1);. If it is invoked on the last frame of a timeline, nextFrame( ) simply stops the playhead on that frame, unless another scene follows the current scene, in which case nextFrame( ) moves the playhead to frame 1 of the next scene.