POTENTIAL CONFLICT AVOIDED AFTER FLC OBSERVATION OF CONFLICTING TFC ON TCASII.

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DURING ARR TO DEN WE WERE GIVEN RADAR VECTORS TO RWY 17R WHERE TRIPLE ILS'S WERE BEING PERFORMED TO THE S. DURING APCH WE CONTINUALLY READ BACK ALL HDGS AND ALTS THAT WERE ASSIGNED. WE WERE GIVEN A DSCNT WHICH WE CONFIRMED BUT AS WE PROCEEDED; IT APPEARED TO BE THROUGH ANOTHER ACR AIRPLANE'S (WITH SIMILAR CALL SIGN) ALT. AS WE NEARED THE LOC; IT APPEARED (THROUGH OBSERVING OUR TCASII) AS THOUGH HE; TOO; WAS INTERCEPTING THE SAME LOC AND WAS EXTREMELY CLOSE. WE ATTEMPTED SEVERAL TIMES TO GET A WORD TO APCH WHO BY NOW WAS EVEN BUSIER THAN BEFORE. AT A POINT WHERE WE WERE WITHIN APPROX 800-1000 FT VERT OF OUR OPPOSING TFC; WE STOPPED OUR DSCNT. WE FINALLY WERE ABLE TO GET A HOLD OF APCH; WHEREUPON BEING NOTIFIED OF OUR PREDICAMENT; GAVE US AN IMMEDIATE CLB AND RADAR VECTOR. AS WE BEGAN OUR CLB AND TURN; WE BROKE OUT OF THE CLOUDS AND SAW OUR OPPOSING TFC. THE FLT CONTINUED WITHOUT INCIDENT TO THE ARPT. TFC WAS VERY BUSY AT THIS TIME. TSTMS WERE IN THE AREA WITH RAIN FALLING AT THE ARPT. THE NEW APCH SYS AT DEN DOES A LOT TO REDUCE DELAYS; BUT IT APPEARS WHEN THE AREA BECOMES SATURATED; A BETTER PLAN FOR CONFLICT WOULD BE IN ORDER. TCASII IS A GREAT TOOL BUT IT TOO HAS A LONG WAY TO GO IN INTERP IN A VERY BUSY ENVIRONMENT.