IN TAKING POS ON RWY 17R FOR TKOF; THE CREW OF THE C-65 FORCED THE TWR TO DELIVER A GAR CLRNC TO ACFT LNDG RWY 17R AT OKC; OK.

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ATC CLRED OUR FLT TO TAXI FROM GATE IN OKC TO RWY 17R FOR DEP. APCHING THE DEP END OF RWY 17R; ATC ADVISED US OF SENECA TFC N OF THE ARPT AND THAT IT WAS NO FACTOR. AS WE TOOK THE RWY; I NOTICED AN ACFT THAT APPEARED TO BE LINED UP ON RWY 17R AND APPEARED TO BE ON ABOUT A 4 MI FINAL FOR OUR RWY. AS WE BEGAN OUR TKOF ROLL; THE TWR INSTRUCTED THE ACFT TO GO AROUND. WE CALLED TWR AFTER TKOF ABOUT THE ACFT. THE TWR THOUGHT WE WERE ON THE OTHER SIDE OF THE ARPT. SUPPLEMENTAL INFO FROM ACN 602329: CAPT CALLED THE TWR AND TOLD THEM WE WERE READY FOR DEP. THE TWR CTLR INFORMED US THAT WE WERE CLRED FOR TKOF ON RWY 17R. AS WE STARTED TO ENTER THE RWY; BOTH CAPT AND MYSELF NOTICED A HIGH WING TWIN ENG ON ABOUT A 4-5 MI FINAL FOR OUR RWY. WE WERE PUZZLED; BUT I CONTINUED OUR TKOF. WE HEARD THE CTLR TELL THIS ACFT TO GO AROUND. CAPT ASKED THE TWR CTLR BEFORE SWITCHING TO DEP CTL IF THE ACFT THAT WENT AROUND WAS PRACTICING APCHS. THE CTLR SAID NO AND THAT HE THOUGHT WE WERE DEPARTING ON RWY 17L. HE INFORMED US THAT HE HAD MADE A MISTAKE.