A CL-65 CAPT WHILE GIVING IOE; THINKS THAT HE IS CLRED ACROSS RWY 17R AT DFW AND CONTINUES TO CROSS. THE CLRNC WAS FOR ANOTHER ACFT.

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WE LANDED ON RWY 17L AT DFW. AFTER CLRING THE RWY; GND CTL INSTRUCTED US TO TAXI ON TXWY Q; TURN R ON TXWY ER; HOLD SHORT OF RWY 17C AND MONITOR TWR. MY FO WAS A NEW HIRE AND I WAS DOING HIS IOE. I NEXT INSTRUCTED HIM TO CONTACT DFW OPS TO MAKE AN 'ON THE GND' CALL. AS WE TURNED ONTO TXWY ER; HE CONTACTED OPS. I WAS MONITORING BOTH TWR AND OPS FREQS. I SHOULD HAVE BEEN MONITORING ONLY TWR; BUT I WAS HELPING HIM WITH UNFAMILIAR RADIO CALLS. I THOUGHT I HEARD TWR INSTRUCT ME TO CROSS RWY 17R; TURN R ON TXWY K AND CONTACT GND. I READ BACK THE CLRNC AND CROSSED RWYS 17C AND THEN RWY 17R. TWR INSTRUCTED ME TO STOP BECAUSE I HAD CROSSED RWYS WITHOUT CLRNC. I HAD READ BACK THE CLRNC OF AN ACFT WITH A SIMILAR SOUNDING CALL SIGN. AT THE TIME OF MY READBACK; ANOTHER RADIO XMISSION BLOCKED MY XMISSION SO THE TWR NEVER HEARD MY INCORRECT READBACK. IF I HAD NOT BEEN MONITORING BOTH FREQS; I WOULD HAVE HEARD THE TWR CLRNC MORE CLRLY AND KNOWN THAT IT WAS NOT FOR ME. I SHOULD HAVE BEEN MORE SUSPICIOUS OF A CLRNC TO CROSS RWY 17R INSTEAD OF RWY 17C AND RWY 17R. IN THE FUTURE; I WILL MONITOR ONLY THE PRIMARY CTL FREQ WHEN TAXIING; AND WHEN IN DOUBT; I WILL CONFIRM RWY XING CLRNCS.