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You can start up Windows Explorer by right clicking on the Windows Start menu, and then clicking Explore. You can also run the executable "Explorer.exe". Right clicking on an object within Explorer usually let's you choose from a number of options in a context menu.
Choosing About from the Help menu in Explorer tells you interesting things such as the version of Windows you are running, and also how much RAM you have on your computer. I bet there are a lot of other cool features of Explorer that I don't even know about. I hope that Explorer is one piece of Windows that we agree Microsoft did a good job with. Wouldn't you say so?