DEP CTLR GIVEN POINTOUT ON GOV FLT CHK ACFT AND SAW THE ACFT LEAVE THE AIRSPACE TO THE E. A P3 CLBING OFF NGU WAS GIVEN A NE HDG AND CLBED TO 11000 FT. SHORTLY THEREAFTER THE DEP CTLR SAW THE GOV SMT DSNDING IN HIS AIRSPACE WITHOUT COORD. THE P3 WAS DSNDED; BUT NOT BEFORE LOSS OF SEPARATION OCCURRED.

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SPC X; A P3; DEPARTED NGU REQUESTING FILED RTE TO NHZ. GOV SMT Y WAS ON AN 11 DME ARC AROUND NGU TACAN AT 6000 FT. SMT Y WAS POINTED OUT TO MYSELF WORKING ORF DEP RADAR CTL. SMT Y EXITED MY AIRSPACE TO THE E. I CLBED SPC X TO 11000 FT ON INITIAL CONTACT AND TURNED THE ACFT TO A HDG OF 070 DEGS. WITHIN 1 MIN OF INITIAL CONTACT WITH SPC X; I OBSERVED SMT Y RE-ENTERING MY AIRSPACE FROM THE SE; HDG IN A NW DIRECTION. SMT Y WAS BEING WORKED BY ORF ARR RADAR AND WAS STILL AT 6000 FT. I AMENDED SPC X TO AN ALT OF 5000 FT. I THEN OBSERVED SMT Y DSNDING THROUGH THE FLT PATH OF SPC X WITHOUT MY APPROVAL. (SMT Y WAS IN MY AIRSPACE BUT BEING WORKED BY ANOTHER SECTOR.) I ISSUED A DSCNT TO SPC X TO 4000 FT; ACFT WAS ALREADY PASSING 4400 FT; AND REACHED 4700 FT BEFORE DSCNT TO 4000 FT. I CALLED ALOUD A QUERY AS TO WHAT SMT Y WAS DOING AND THE CTLR OF A THIRD SECTOR STATED HE WAS GIVEN CTL OF SMT Y FOR DSCNT INTO PHF. THE ORF ARR CTLR GAVE CTL OF SMT Y TO ANOTHER SECTOR WITHOUT MY KNOWLEDGE. USE OF PROPER COMS PROCS WOULD HAVE PREVENTED THIS OCCURRENCE.