ACFT BEING VECTORED OUT OF HOLDING PATTERN HAS LTSS WITH ANOTHER ACFT HOLDING. TRAINING IN PROGRESS CTLR.

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TRAINING IN PROGRESS ON SECTOR 26 RADAR POS. SECTOR 26 IS THE METER/ARR SECTOR FOR THE BYSON GATE AT DEN. DEN HAD SNOW WITH UP TO 20 MIN DELAYS. ACFT 1 WAS DSNDED TO FL200 IN HOLDING AND TOLD TO HOLD HIS OUTBOUND HDG IN THE HOLDING PATTERN. ACFT 2 WAS 10 MIN IN TRAIL. DSNDED TO FL200 TO HOLD HIS OUTBOUND HDG. ACFT 1 WAS CLRED TO DEN VIA L TURN TO INTERCEPT THE DEN 213 RADIAL; DSND AND MAINTAIN FL170. AS ACFT 1 TURNED AND DID NOT DSND R AWAY; HE CAME IN CONFLICT WITH ACFT 2 STILL HOLDING THE OUTBOUND HDG. DENVER ARTCC HAS A COMPUTER ID THAT PUTS A 5 MI RING AROUND AN ACFT. THE RING WAS ON ACFT #1 INSIGHT. CONFLICT ALERT DID NOT ACTIVATE NOR DID THE ERROR DETECTION PROGRAM. THE SUPVR WAS BEHIND THE CTLR AND SAW THE SITUATION. I ASKED THE SUPVR IF I HAD A DEAL AND HE SAID NO; SINCE THE ERROR DETECTION DID NOT GO OFF. SINCE THE SUPVR WAS AWARE OF THE SITUATION AND SAW THE SITUATION; I FELT NO ACTUAL ERROR OCCURRED. NOW ON 11/MON/91 I UNDERSTAND THAT QUALITY ASSURANCE AT DEN ARTCC IS INVESTIGATING THE SITUATION.