Multiplayer game: how to sync FPS of different PC? [closed]

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i'm wondering how can i "sync" the speed (obviously, to the less fast) of different PC ? My is a 2d racing game, written in C# + SDL.NET. How to "move" object on screen at the "same" speed on all PCs sending "state" variable only 3 times per second (for instance) ? Thanks

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This is the friendliest article I've read on the matter. You should look at all the game physics articles from this guy (GafferOnGames)

Fix Your Timestep!

Even an RK4 integrator is sensitive to the amount of time you step when integrating. Decouple your physics timestep from the display framerate so that your simulation behaves exactly the same way each time it is run.

...then continue with this one:

What every programmer needs to know about game networking

A brief overview of the history of PC multiplayer games. Discover how RTS games were able to synchronize thousands of units over a 28k modem, and how first person shooters hide lag with client side prediction and latency compensation.

Hope you'll find it as eye-opening as I did.