Look at it like this. When you start up the computer, a chunk of the processes necessary to run the OS is loaded into RAM. If you click on a shortcut or manually launch an app, its code is loaded into RAM in order to run.
You can not access most of what is in your RAM. Though before you save, all of any word document is in RAM and you can access that.
RAM is not meant to be tinkered with. It is there to use, and your computer will automatically hand it out as needed. You don't have to worry about it.