Saving In Game Data

Hello!
Im not sure what keyword to use to search the forum for this, but can someone tell me how to save in game data?

For example…how much ammo is left, items that have been picked up…an objects INT property value etc…

Its so when the character enters a different level, that sort of data is also transfered to that level. Like…if you 5 bullets before entering a new room, you will still have 5 bullets once you have entered it.

Another example is if an object has a INT value of 1, the value of that object will remain 1 (like with the bullet thing i explained above) and the game will remember that information through out the game.

thanks!

I learned to do it usingthis tutorial, but there may be new and different ways to do it. Note that the tutorial may not be 2.50 compatible.