This is what these registry files do:

NTARnOff.reg    : NT4 only! Turn CD autorun feature on and off. NT needs to
NTARnOn.reg       be restarted afterwards.

EjCDLOff.reg    : Turn on/off Nero`s "eject the CD later" feature. This
EjCDLOn.reg	  prevents the CD eject after burning until the status
                  dialog is closed. No more dusty recorders...

WCDDrOff.reg    : Experimental feature to try to "wake up" CD Rom drives during
WCDDrOn.reg       "on the fly" copies. This might help for some CD Rom drives
                  which cause buffer underruns after the spindle motor is
		  turned off during leadin writing on the recorder.

ahead software gmbh, april 9th 1998