2 ACFT FAIL TO FOLLOW VECTORS AND A TCASII RA RESULTS.

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ACR A; AN LTT; 12 MI E OF RDU AT 4000 FT NBOUND; WAS INSTRUCTED TO TURN L HDG 370 DEGS AND FOLLOW AN MLG AT 11 O'CLOCK; 4 MI INBOUND; DSNDING OUT OF 3000 FT AND WAS CLRED FOR THE VISUAL APCH TO RWY 23R. ACR A ACKNOWLEDGED THE TURN AND THE CLRNC. ACR B; A WDB; 13 MI NNE OF RDU AT 4000 FT; WAS TOLD TO TURN R HDG 140 DEGS BASE LEG. ACR A WAS THEN TOLD TO DSND TO 2000 FT. ACR B WAS THEN TOLD ABOUT ACR A; 1 O'CLOCK; 3 MI; NOW ON A DOG LEG FINAL WHO HE WAS TO FOLLOW. ACR B SAID HE WAS LOOKING. AT THAT POINT I NOTICED ACR A HAD GONE THROUGH FINAL AND I INSTRUCTED HIM TO TURN L HDG 210 DEGS TO THE ARPT. IN THE SAME XMISSION I TOLD HIM ABOUT THE WDB AT 2 O'CLOCK; 3 MI (ACR A WAS DSNDING OUT OF 3600 FT AT THIS POINT). HE RPTED THE WDB IN SIGHT AND WAS INSTRUCTED TO MAINTAIN VISUAL SEPARATION. ACR B WAS TOLD THE LTT HAD HIM IN SIGHT AND WAS MAINTAINING VISUAL SEPARATION AND AGAIN HE SAID HE WAS LOOKING. I THEN TURNED THE WDB TO 090 DEGS TO FOLLOW THE LTT AND TOLD HIM TO EXPECT VECTORS ACROSS FINAL FOR SPACING. ACR B WAS THEN OFFERED RWY 23L; HE DENIED IT. ACR B ALSO DIDN'T TURN TO 090 DEGS AS INSTRUCTED. ACR B THEN ASKED WHO WAS THE ACFT BELOW HIM. I TOLD HIM THAT WAS THE ACFT MAINTAINING VISUAL FROM HIM. I KNEW AT THIS POINT ACR B WASN'T PAYING ATTN (TYPICAL WITH ACR WDB CREWS). ACR B WENT ACROSS FINAL AND WAS TURNED BACK WBOUND TO FOLLOW ACR A. ACR B RPTED HIM IN SIGHT AND WAS INSTRUCTED TO FOLLOW AND WAS CLRED A VISUAL APCH TO RWY 23R. ACR A APOLOGIZED FOR THE OVERSHOOT BEFORE GOING TO THE TWR. ACR A HAD GONE THROUGH FINAL APPROX 2 MI FOR WHICH THERE WAS NO CAUSE. I HAD 2 ACFT ON THE FREQ NOT PAYING ATTN TO WHAT THEY'RE SUPPOSED TO BE DOING. MADE A ROUTINE; SIMPLE; EVERYDAY OCCURRENCE ALMOST A BAD SIT. I ALSO BELIEVE THAT TOO MANY PLTS ARE LOOKING AT THEIR TCASII INSTEAD OF LOOKING OUT THEIR WINDOW AND MISSING WHAT IS ACTUALLY GOING ON. SUPPLEMENTAL INFORMATION FROM ACN 251877: I WAS INFORMING FO OF 12 O'CLOCK TFC WHEN SIMULTANEOUSLY; ATC CALLED WDB AT 3 MI; 12 O'CLOCK (I TOLD ATC WE HAD WDB IN SIGHT). TCASII TA FOLLOWED RAPIDLY BY TCASII DSND RA. FO COMPLIED WITH RA. WE PASSED APPROX 800-1000 FT BELOW WDB. BECAUSE OF ALL THIS COMMOTION IN COCKPIT AS WE APCHED FINAL COURSE; WE OVERSHOT FINAL 1-2 MI. COMPLETED VISUAL APCH. AFTER TALKING WITH ATC SUPVR; FOUND OUT CTLR WAS BEING TRAINED AND ATC WAS HAVING SHIFT CHANGE.