> Is resetting PRAM the same as resetting NVRAM, or are they two 
> different things? 

PRAM (=Parameter RAM) is apple-speak for the small memory built
using an NVRAM (=Non Volatile RAM) technology chip for the
purpose of storing a couple of parameters e.g. the ones relevant 
for booting and a few more

NVRAM is actually a CMOS/SRAM (Static RAM) technology flavor: 
it is particularily low-power and suits applications where a
little bunch of data is to be kept over periods of no ac power

today one rather would choose FLASH memory technology for such
purposes, but since the hw-clock needs to be run continuously
anyway even when a computer is unpowered -this can only 
accomplished with some sort of battery- clock chips usually
come equipped with a few kB of NVRAM too an thus motherboard
designers make use of it

in peecee-speak the equivalent is "BIOS parameter RAM" or just
"in the BIOS" - but who wants to speak pc anyway?  ;-)