EWR OJT INSTRUCTOR DESCRIBED NEAR OPDEV INVOLVING GAR DURING POSITION RELIEF BRIEFING; CITING LACK OF RADIO COM PORTS AS CONTRIBUTORY.

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AT EWR ARPT; AN ACFT LNDG RWY 4R WAS INSTRUCTED TO GO AROUND DUE TO TFC ON THE RWY; AT THE SAME TIME A RWY 4L DEP WAS JUST BREAKING GND DOWNFIELD. CTL INSTRUCTIONS WERE GIVEN TO SEPARATE THESE 2 ACFT BY A TRAINEE WHO WAS IN THE PROCESS OF BRIEFING A RELIEVING CTLR. THE INSTRUCTOR (ME) GAVE THE TRAINEE INSTRUCTIONS TO AVOID CONFLICT WITH TEB ILS RWY 6 ARRS; HOWEVER THE TRAINEE GOT CAUGHT UP IN THE HEAT OF THE MOMENT AND ISSUED HIS OWN INSTRUCTIONS; WHICH PUT THE RWY 4L DEP IN DIRECT CONFLICT WITH THE TEB ILS RWY 6 ARR. I WAS ABLE TO CALL THE DHO LINE WITH N90 AND ADVISE APCH CTL AS TO THE PENDING SITUATION AT WHICH TIME THEY TURNED THE TEB ARR AWAY FROM THE EWR DEP. SEVERAL GLARING ISSUES STAND OUT FROM THIS EPISODE; ONE WHICH HAS BEEN ADDRESSED OVER AND OVER AGAIN IN THE PAST. THE EWR MISSED APCH PROC FOR ACFT LNDG RWY 4R CONFLICTS WITH THE DEP PROC FOR ACFT DEPARTING RWY 4L. THIS IN TURN LEAVES A CTLR LITTLE ROOM TO MANEUVER ACFT ON GAR'S OR MISSED APCHS FROM BOTH TEB AND LGA AIRSPACE. ALSO DANGEROUS IS THE FACT THAT THE TRAINEE WHO WAS PROVIDING A POS RELIEF BRIEFING AT THE TIME OF THIS INCIDENT WAS UNABLE TO RESPOND TO HIS TRAINER'S INSTRUCTIONS TO RESOLVE THIS CONFLICT. WHILE I (TRAINER) WAS AWARE OF THE SITUATION AND GIVING INSTRUCTIONS TO THE TRAINEE; I DID NOT HAVE OVERRIDE CAPABILITY AS THE RELIEVING CTLR (WHO WAS UNAWARE OF THE PENDING SITUATION; DUE TO THE FACT HE HAD JUST PLUGGED IN); WAS PLUGGED INTO THE JACK THAT WOULD HAVE GIVEN ME THE CHANCE TO ISSUE THE PROPER CTL INSTRUCTIONS.