IDE :: Is Flash Frame Or Time Dependant

if for example the player moves, does it move him every x seconds or every x frames?like, if the flash game runs on somebody with fast computer and other has slow computer, so his game runs slower, so it can result in the player moving slower than the guy with the fast computer. so ya they'll move in 2 different speeds. in c++ you gotta add sort of timer for this so it depends on time incase the player lags or something. sometimes you gotta have 2 buffers for the screen, so while something is displayed on screen it loads the other buffer in the background, and then shows the finished loading buffer and so on. this way there are no graphic bugs.