AT A NON TWR ARPT A COMMUTER LTT TAXIED ACROSS A RWY WHILE AN ACFT WAS STILL COMPLETING LNDG ROLL ON THE RWY.

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ON 12/THU/91; MYSELF AND THE DESIGNATED PIC WERE SHOOTING AN ILS APCH TO RWY 24 AT THE STATE COLLEGE UNIVERSITY PARK ARPT; AN UNCTLED FIELD. WE WERE BOTH CAPT QUALIFIED ON THE ACFT AND DUE TO PLT SHORTAGES AT OUR COMPANY WE WERE ASSIGNED TO FLY TOGETHER. AS PER COMPANY POLICY; THE SENIOR CAPT OCCUPIES THE L SEAT. I WAS THE JUNIOR CAPT THEREFORE I WAS PERFORMING THE FO DUTIES AS SECOND IN COMMAND. IT HAD BEEN OVER A YEAR SINCE I HAD FLOWN INTO STATE COLLEGE ARPT AND I FEEL THAT AS A CAPT OCCUPYING THE R SEAT I AM NOT AS FAMILIAR NOR COMFORTABLE WITH THE DUTIES ASSOCIATED WITH OCCUPYING THE R SEAT. AT APPROX AN 8 MI FINAL THE CENTER CTLR CLRED US FOR THE APCH AND HANDED US OFF TO THE ADVISORY FREQ. AT THAT TIME I CALLED UNIVERSITY PARK UNICOM AND ASKED FOR AN ARPT ADVISORY. THEY RPTED THAT RWY 24 WAS IN USE AND GAVE ME THE CURRENT WINDS AND RPTED NO TFC WAS IN THE AREA. I ANNOUNCED OUR POS OVER THE CTAF AND ASKED IF THERE WAS ANY TFC TO PLEASE ACKNOWLEDGE. I ALSO ANNOUNCED TWO MORE POS RPTS ON A 4 THEN ON A 1 1/2 MI FINAL FOR RWY 24 AT UNV. UPON LNDG ROLLOUT; I NOTICED AN SMA OVERHEAD THE FIELD TO ENTER WHAT I ASSUMED TO BE A L DOWNWIND FOR RWY 24 AT UNV. AFTER CLRING THE RWY END; I RPTED OVER THE CTAF THAT WE WERE 'DOWN AND CLR OF RWY 24 AT UNV.' AS WE STARTED THE AFTER LNDG CHKLIST I REMEMBER HEARING THE SMA TFC ANNOUNCING HIS POS OVER THE CTAF. I ASSUMED THAT HE WAS LNDG ON THE ACTIVE RWY (24) SINCE BOTH AWOS-1 AND UNICOM RPTED THIS RWY WAS IN USE. WHILE TAXIING TO THE RAMP WE STARTED XING RWY 16-34 WHEN I LOOKED TO MY R AND NOTICED THE SMA WAS ON THE RWY. I IMMEDIATELY NOTICED THAT HE WAS NOT MOVING VERY FAST AND APPEARED TO BE AT TAXI SPD. THERE WAS NO DANGER OF A GND COLLISION AND NO EVASIVE ACTION WAS NECESSARY. WE CONTINUED TO THE RAMP AND PARKED OUR ACFT AT THE GATE. I BELIEVE WHAT MIGHT OF HAPPENED WAS THAT THE SMA LANDED ON RWY 34 INSTEAD OF THE PUBLISHED ACTIVE; RWY 24 AND WAS ABLE TO SLOW TO TAXI SPD IN ANTICIPATION THAT WE MAY NOT STOP PRIOR TO THE INTXN. THERE IS ALSO A POSSIBILITY THAT THE SMA DID LAND ON RWY 24 AND MADE A R TURN ONTO RWY 34 TO TAXI TO THE CARGO RAMP WHICH IS LOCATED R OFF RWY 34. IT WAS REALLY HARD TO TELL BECAUSE OF THE SLOW SPD OF THE ACFT. OF THE MANY FACTORS THAT WERE INVOLVED DURING THIS INCIDENT I BELIEVE THESE WERE THE MOST PREVALENT: CAPT OCCUPYING THE R SEAT AND NOT BEING COMFORTABLE AND FAMILIAR IN THIS ROLE. CREW HAD NOT BEEN TO THE ARPT IN OVER A YEAR. CREW NOT LISTENING TO ADVISORY TRANSMISSIONS MADE BY OTHER ACFT. ACFT NOT USING ACFT RWY ADVISED BY UNICOM.