The File use tool provides information about which files are open.
Programs running on your computer shows you the programs that are currently running. You can select a program from this list to see which files it has opened.
Files opened by the program selected above shows you which files, folder or pipes are opened by the program you selected by clicking in the list above.
A program needs to open a file in order to read or write information to that file. The same is true for folders (also called directories).
A special kind of program, called a pipe, is used for communicating between two programs. Many modern programs on Windows or Linux use pipes to communicate between themselves. The File Use tool also shows you information about which pipes a program has opened or created.