FPS and Timing

I know this is kinda a noob question:

When I create a game, what is the best way to make timing: Do use a counting int in my loop, or to use the real clock to way it should move 0.1 in a second for something like that?

In other words is BlitzMax locked at a certain FPS, so I know that I get 60 fps for exsample on all computers? (Able to handle the gfx in that speed ofcause)

Thanks in advance

Ok, so I looked into it myself a little further and found this great ebook: http://www.blitzbasic.com/Community/posts.php?topic=42519

On page 35 there is a perfect chapter about this :D