PVSnesLib is a Nintendo Super NES library used to create homebrew games. The main goal is to have something easy to use by anyone. To run games created with this library, you need a cartridge like the RetroUsb Powerpak or Krikzz Super Everdrive or Neoflash Snes cartridge. If you don’t have one, you can test your homebrew with an emulator (bsnes is really great but slow, no$sns is nice too, like zsnes). Hope you will enjoy working with libSnes !
If you have any questions, you can post it on PVSnesLib's forums. Also, if you are looking for a list of the PVSnesLib functions, with detailed information, just seach the official documentation shipped with the library.