CORPORATE MU2 HAD LTSS FROM COMPANY MU2. SYS ERROR.

Narrative

I WAS WORKING DEP AND ARR COMBINED AT ATL. THINGS WERE GETTING BUSY. SATELLITE HAD BEEN OPEN FOR SOME TIME AND ARR WAS TAKING THE ARR AIRSPACE. 2 MU2'S DEPARTED BACK TO BACK; THE 1ST TO A DEST N OF ATL AND THE 2ND TO THE E. THE 1ST ACFT X WAS RADAR IDENTED AND ISSUED CLB TO 10000 FT. (ALL PROPS AT ATL ARE INITIALLY ASSIGNED 4000 FT BY CLRNC DELIVERY). THE 2ND ACFT Y WAS NOT RADAR IDENTED; BUT I ISSUED A CLB TO 10000 FT KNOWING THAT THERE WAS NOTHING IN HIS WAY ON THE 'NOISE TRACK;' THE STANDARD DEP HDG GIVEN ACFT THAT ARE TO BE WORKED BY DEP. AFTER A COUPLE OF MINS OF NOT BEING ABLE TO LOCATE THE ACFT Y I STOPPED DEPS SO I COULD GIVE THIS MORE OF MY ATTN. I DETERMINED THROUGH QUESTIONING THE PLT HIS DME FROM ATL AND HIS ALT; SO I BEGAN APPLYING NON-RADAR PROCS OF LEVELING OTHER DEPS OFF BELOW HIM AND VECTORING AWAY FROM THE AREA I BELIEVED HIM TO BE. ANOTHER CTLR CAME OVER TO HELP AND THROUGH WORKING WITH THE CTR AND HAVING THEM LOOK FOR HIS BEACON CODE; WE FOUND HIM -- NOT ON THE 070 DEG HDG I ANTICIPATED BUT ON THE 020 DEG HDG GIVEN TO DEPS BEING WORKED BY SATELLITE. HE WAS ON THE ARTS II COMPUTER SYMBOL ASSIGNED TO SATELLITE DEPS; WHICH WAS WHY HE WAS NOT ON MY SCOPE. THE 020 DEG HDG WAS A CONVERGING COURSE WITH THE OTHER MU2; WHICH WAS NBOUND -- A TURN I FELT WOULD BE GOING AWAY FROM THE UNIDENTED MU2. I GAVE BOTH ACFT IMMEDIATE TURNS AWAY FROM EACH OTHER SO THAT BY THE TIME 3 MI SEPARATION WAS LOST THE ACFT WERE ON DIVERGENT HDGS. TECHNICALLY; THIS ACFT SHOULD HAVE BEEN PUT ON THE SATELLITE TRACK OF 020 DEGS; BUT MANY TIMES WE TRY TO HELP OUT 'QUICK' AIRPLANES LIKE THE MU2 BY GIVING THEM TO DEP SO THEY CAN CLB EARLIER. ALSO; THE STRIP WAS SENT TO DEP; NOT SATELLITE; ANOTHER INDICATOR THE ACFT WOULD BE ON THE DEP TRACK. FOR MY PART; I ISSUED AN ALT CHANGE TO AN ACFT NOT RADAR IDENTED. IT WOULD HAVE BEEN MUCH WORSE; PROBABLY; TO HAVE SOMEONE ZIPPING AROUND AT 4000 FT. ALSO; WHEN YOU'RE WORKING DEP; TO STAY IN YOUR AIRSPACE YOU MUST KEEP GOING UP. THE SATELLITE CTLR; I THINK; SHOULD HAVE NOTICED SOMEONE ON HIS SYMBOL; CLBING UP OUT OF HIS ALTS; THAT HE WASN'T TALKING TO.