AIRCRAFT X ON HIS LANDING ROLL ON RWY 6; ENCOUNTERED ACFT Y; ALSO ON HIS LNDG ROLL ON RWY 33; ACFT Y PASSED WITHIN 150 FT OF ACFT X. ACFT Y WAS NOT ON THE CORRECT FREQUENCY.

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INBOUND TO ISM I WAS ON MCO APCH FREQ AND WAS VECTORED THRU THE CLASS B AIRSPACE. UPON GETTING CLOSER TO ISM MCO INSTRUCTED ME TO RESUME OWN NAV AND SWITCH TO ISM COMMON TFC FREQ. I SWITCHED TO 124.45 AS PER AFD AND SPOKE WITH ANOTHER ACFT AND A HELICOPTER THAT WERE ALREADY IN THE PATTERN. ONE OF THE AIRCRAFT WAS ON A 2 MILE STRAIGHT IN FINAL FOR RWY 6. I ENTERED 45 DEGREES DOWNWIND R TFC FOR RWY 6 AND ADVISED I WOULD FOLLOW HIM IN. UPON HIS LNDG HE ADVISED ME OF WIND AND I CONTINUED MY APCH. I LANDED ON RWY 6 AND AS I CROSSED RWY 23 I OBSERVED A KING AIR LNDG TOWARDS ME. I TURNED TO THE LEFT TO ALLOW EXTRA SPACE AND IMMEDIATELY EXITED THE RWY. AS I WAS TAXIING THE PLT OF THE OTHER ACFT APCHED ME AND BECAME BELLIGERENT STATING THAT I CROSSED IN FRONT OF HIM. I INFORMED HIM THAT I WAS ON THE CTAF AND WAS SPEAKING WITH OTHER TFC AND THAT WE NEVER HEARD OR SAW HIM. HE ARGUED THAT THE PROPER FREQUENCY IS 122.95 WHICH IS THE UNICOM FOR THIS FIELD. I EXPLAINED THE ORLANDO APPROACH TOLD US TO CONTACT TFC ON THE CTAF AND THAT WE WERE SPEAKING WITH THE OTHER TFC. I AGAIN RADIOED MCO APCH AND CONFIRMED THAT WE WERE ON THE PROPER FREQUENCY. CALLBACK CONVERSATION WITH THE RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE INCIDENT WAS THE CLOSEST THAT HE HAS COME TO ANOTHER ACFT. BECAUSE OF THE LIMITED CONSERVATION HE HAD WITH THE PLT OF THE KING AIR. HE BELIEVES THAT THE KING AIR PLT WAS UNAWARE OF THE REQUIREMENT TO USE THE CTAF FREQUENCY AND NOT THE UNICOM; TO ADVISE OTHER ACFT OF HIS INTENTIONS.