ICT CTLR EXPERIENCED OPERROR AT APPROX 3000 FT TO 5000 FT BTWN 2 ARR ACFT WHEN DISTR BY OTHER DUTIES AND INCORRECT DATA BLOCK INFO.

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WE HAD JUST CHANGED OUR APCHS FROM SIMULTANEOUS VISUAL APCHS TO RUNNING ILS APCHS TO RWYS 19R AND 19L. I WAS WORKING BTWN 4-5 ACFT IN ICT RF AIRSPACE. THE INCIDENT ACFT WERE IFR CITATION ACFT X AND IFR ACFT Y. ACFT X WAS ON A R BASE 18 MI NW FOR AN ILS APCH TO RWY 19R. ACFT Y WAS ON A DOGLEG TO FINAL FROM 25 MI NE FOR THE ILS RWY 19L. ACFT X WAS GOING TO BE FIRST. I DSNDED ACFT Y TO 4000 FT AND SLOWED HIM TO 170 KTS FOR THE SEQUENCE BEHIND ACFT X. CLOSER TO THE ARPT; I HAD IFR CESSNA CARAVAN APPROX 10 MI NW ON A R BASE FOR THE ILS RWY 19L; AT THE SAME TIME I HAD A SUPPOSEDLY VFR CITATION 12 MI NW FOR THE STRAIGHT-IN RWY 19R. I VECTORED THE CITATION IN BEHIND THE CARAVAN AND TURNED THE CARAVAN ON THE ILS RWY 19L. THE CARAVAN WENT THROUGH THE FINAL AND I HAD TO GIVE HIM ANOTHER TURN FROM THE E TO RE-INTERCEPT. AFTER I DID THIS; THE CITATION RPTED THAT HE HAD THE CARAVAN IN SIGHT. I INSTRUCTED THE CITATION RESUME HIS OWN NAV FOR RWY 19R AND CONTACT ICT TWR. THIS IS WHEN THE CITATION INSTRUCTED ME THAT HE WAS EXPECTING THE ILS APCH AND THE FIRST TIME I THOUGHT THAT HE MIGHT BE IFR. I WAS ABLE TO TURN HIM ON THE APCH IN TIME BUT HAD TO THEN BREAK OUT THE CARAVAN TURNING HIM L TO A 010 DEG HDG. THE CARAVAN TURNED THE WRONG DIRECTION; A R TURN DIRECTLY IN TO THE CITATION. I FORCIBLY REITERATED A L TURN AND THE PLT CORRECTED HIMSELF QUICKLY. AT THE TIME THIS WAS GOING ON; I WAS LOSING SEPARATION BTWN ACFT X AND ACFT Y. I QUICKLY TURNED ACFT X R TO A 190 DEG HDG TO PARALLEL THE FINAL APCH COURSE AND AN ATTEMPT TO MAINTAIN APPROPRIATE SEPARATION. I THEN REALIZED THAT SEPARATION WAS STILL DECREASING. I ATTEMPTED TO TURN ACFT X TO A 220 DEG HDG TO GAIN DIVERGENCE BUT IN DOING SO USED AN INCORRECT CALL SIGN. I STATED RJ (I WAS ALSO WORKING AN ACFT N OF THE INCIDENT AREA). ACFT X ASKED IF THE INSTRUCTION WAS FOR HIM; BUT I WAS ISSUING ANOTHER INSTRUCTION TO ANOTHER ACFT. WHEN THE RADIO WAS FREE; ACFT X ASKED AGAIN IF THE 220 DEG HDG WAS FOR HIM. I SAID 'AFFIRMATIVE.' SHORTLY AFTER ACFT X STARTED HIS TURN; APPROPRIATE SEPARATION WAS LOST. I CONTINUED WORKING THE SEQUENCE UNTIL I WAS RELIEVED. THE SUPVR STATED THAT HE NEEDED TO LOOK INTO THE INCIDENT. WE ALSO FOUND OUT THAT THERE WAS A SOFTWARE GLITCH WITH THE ARTS IIE IN THAT EVEN THOUGH THE CITATION HAD BEEN GIVEN AN IFR CODE THE DATA BLOCK STILL SHOWED A 'V' FOR VFR.