Folder tabs... Feature or Addon?


Hello all,

I'm new to the Mac scene. A few years ago my friend had a Mac with OS 9 on it. He had it setup so when he dragged his folders to the side or bottom of the screen they turned into little folder tabs. I thought this was really cool and wanted to know if this was part of OS 9 or if it was some app that could be installed. I have OS 10.4.1 and was hoping I could get my new Lappy to do this. Thank you for your help.

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