sinclair_tm

If you dual boot, then only one OS is running at a time, so the loaded OS will use whatever RAM you have installed. You have 2GB or RAM, so when you are in OS X, it'll have all 2 GB. If you are in Vista, it'll have the 2GB. Parallels is a software package that allows you to run Windows inside of the Mac OS, and yes, then you will have to "share" the RAM. I quote it because OS X will still be in charge of all the RAM, but Parallels is a program, and it will request to use whatever amount of RAM you tell it to show Windows it has. But for playing games, you will want to boot into Windows, which means you have all you need. Just run Boot Camp found in your Utilities folder and it will help you partition the hard disk so you can install Windows. Just remember though, the Macbook has an Intel GPU, and you are not going to get the best frame rates on newer games.