ACR MAKES APCH AND LNDG AT ARPT WHEN ARPT WX MINS FOR LNDG ARE LESS THAN REQUIRED.

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DEPARTED DCA AM:05 ARRIVED GSO AT AM:09 EST. UPON PICKING UP OUR WX PACKAGE PRIOR TO DEPARTING DCA I NOTICED THE GSO WX TO BE: WX 1/16F 184/38/37/2307/006 R23 VR2 2 V35. BUT I OVER LOOKED A GSO NOTAM: FDC NOTAM 001 1/0699/GSO/F1/T PIEDMONT TRIAD INTL. GREENSBORO. N/C. ILS 23 (CATII) AMDT 7..PROC NA... WHEN WE CONTACTED GSO APCH CTL WE WERE ASKED WHAT OUR MINS FOR THE APCH TO 23 WERE. WE REPLACED 1200 RVR. AT THAT TIME WE WERE ADVISED RUNNING 23 RVR TO BE 1200 FT. WE WERE VECTORED TO AND CLRED FOR THE APCH TO RWY 23. WE CONDUCTED A COMPLETE AUTO PLT MONITORED CATII ILS APCH. ALL ACFT SYS NORMAL AND ALL ILS SIGNALS APPEARED NORMAL. I HAD THE APCH LIGHTS AND RWY TOUCH DOWN AREA IN SIGHT PRIOR TO DH. THE LNDG WAS NORMAL AND WE TAXIED OFF THE RWY AT TAXIWAY M WHICH GOES DIRECTLY INTO OUR GATE AREA. AT NO TIME WERE WE ADVISED; BY ANYONE INCLUDING GSO APCH CTL; OF ANY PROBLEMS WITH THE CATII ILS APCH SYS TO RWY 23 AT GSO. AFTER PARKING THE ACFT I WALKED INTO GSO OPS AND THERE WAS SOME DISCUSSION GOING ON ABOUT THE RWY 23 CATII APCH NOT BEING AUTHORIZED. I RETURNED TO THE ACFT AND RECHKED THE WX PACKAGES AND THEN NOTICED THE ABOVE MENTIONED NOTAM. MY COPLT SAID THE ATIS INFO DID NOT MENTION ANY PROBLEMS WITH THE ILS SYS. I DON'T REMEMBER THE WORDS CATII BEING USED IN ANY OF OUR COM WITH GSO APCH CTL; BY US OR THEM. I ASSUMED THAT WHEN WE TOLD APCH CTL OUR MANEUVERS FOR THE APCH WERE 1200 FT THAT THEY KNEW 1200 FT REQUIRED CATII APCH PROC. APPARENTLY THEY DID NOT KNOW THAT BECAUSE IF THEY DID THEN WE SHOULD HAVE BEEN ADVISED THAT THE CATII APCH WAS NOT AUTHORIZED. IT SEEMS TO BE THAT THE TRANSFER OF PERTINENT INFO TO PLTS FROM ATC AND DISPATCHERS COULD BE IMPROVED.