MCO CTLR EXPERIENCED OPERROR WITH CLBING LJ31 AND DSNDING C550 TFC AT 3800 FT PENETRATING THE ADJACENT CTLR'S AIRSPACE WITHOUT A POINTOUT.

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I ISSUED THE WRONG ALT AND DID NOT CATCH IT ON READBACK. THE CONFLICT ALERT DID NOT ACTIVATE UNTIL THE LAST MIN. THIS IS BETTER THAN NOTHING; BUT TOO LATE. THE ACFT WERE ON CONVERGING HDGS ALL ALONG AND WERE CLBING AND DSNDING TOWARDS EACH OTHER. I GAVE AN ALTERNATE INSTRUCTION BUT TOO MUCH TIME HAD PASSED. SUPPLEMENTAL INFO FROM ACN 619486: I WAS WORKING SATELLITE 'D;' RESPONSIBLE FOR DEPS OFF ORL. THE LEARJET DEPARTED RWY 25 INTO MY AIRSPACE WHERE I AM ABLE TO CLB TO 4000 FT. I ASKED THE LEARJET TO EXPEDITE TO 4000 FT BECAUSE I HAD TFC AT 3000 FT; I NEEDED TO GET HIM ABOVE SO I COULD TURN HIM ACROSS THE TOP OF MCO IN ACCORDANCE WITH LCL PROCS. AS HE WAS CLBING; A CTLR AT ANOTHER SECTOR WARNED ME; AT THE SAME TIME AS THE CONFLICT ALERT WENT OFF; OF AN ACFT NOT UNDER MY CTL DSNDING THROUGH MY ALT. I IMMEDIATELY CALLED THE TFC. THE CTLR; WHO WAS WORKING THE OTHER ACFT; SAID HE HAD VISUAL SEPARATION AND I RELAYED THAT TO MY ACFT. I WAS TOLD BY HIM THAT HE RESPONDED TO THE RA HIS EQUIP GAVE HIM.