When I want to reuse folders, I just attach one of these tabs and when I am done with the folder, I just pull it off and throw it away. Saves money and is a "green" way of doing business by not throwing away the folder and reusing it.
This is something I can grab and use without having to go through all of the normal steps when using the computer. I especially like that they are designed to be written on, which make the ink not smear.