Finding the Serial library (for AVR Studio)

Hello everyone, I'm very new to arduino as you can see.

I prefer programming in AVR Studio (sorry Arduino fans) and i've managed to copy and compile the ethernet example of the WebClient without the main routine, so just the library.

In the main routine I see things like Loop and Serial,... And i want to use the arduino librarys so where can i find the serial library?

Thanks

Look for HardwareSerial.h and HardwareSerial.cpp.