got a gamecube again...

Hey dudes!
I was wondering.
Yesterday, I bought a gamecube again and I remember streaming games with PSO and such so I started looking for PSO and the BBA again

I remember that there was a dol file, which made it possible to swap discs and play burned discs with no modification what so ever.
What was it called again and can anyone point it to me?

Thanks in advance.

Jeroen