You can use many commands to control the flow of a Flash movie. Here is a list:
stop Pauses the current timeline on the current frame.
play Continues the flow of a movie after a stop command.
gotoAndStop Jumps to a frame name or number and pauses the movie there.
gotoAndPlay Jumps to a frame name or number and lets the movie continue animating from there.
nextFrame Moves the movie to the next frame and stops it there.
prevFrame Takes the movie back one frame and stops it there.
The stop command is usually placed in a frame script to pause the movie and let the user take control of what happens next. The other movie control commands are usually placed in on (release) button handlers.