HDG TRACK DEV BY A B737 FLT CREW WHEN THE PIC; PF; HAS NOT SET THE CORRECT HEADING ON HIS ILS COURSE SELECTOR FOR AN APCH TO RWY 35R AT DEN; CO.

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PARALLEL APCHS WERE IN PROGRESS AT DEN RWY 35L&R. I HAD BEEN CLRED FOR THE APCH RWY 35R; AUTOPLT ENGAGED; ARMED VOR/LOC; ON INTERCEPT HDG OF 290 DEGS WHEN LOC CAPTURED. THE ACFT TURNED L; AWAY FROM THE FINAL APCH COURSE. I IMMEDIATELY DISENGAGED THE AUTOPLT AND MADE A R TURN TO REJOIN THE FINAL COURSE OF 350 DEGS. THE FLT DIRECTOR WAS GIVING THE WRONG INFO TO TURN L. APCH CTL ASKED WHAT WAS WRONG. WE TOLD HIM WHAT HAD HAPPENED. HE THEN GAVE US A CLRNC TO DSND TO 7500 FT AND REJOIN THE APCH. WE WERE STILL TRYING TO FIGURE OUT WHAT HAD HAPPENED. WE WERE STILL GETTING CONFLICTING INFO FROM THE FLT DIRECTOR. WE WENT FULL SCALE DEFLECTION TO THE R OF COURSE WHEN WE WERE BREAKING OUT. JUST AS WE WERE BREAKING OUT; THE FO DISCOVERED THAT I HAD FAILED TO SET IN THE FINAL APCH COURSE OF 350 DEGS IN THE WINDOW. IT WAS SET AT 180 DEGS. THIS IS WHY WE WERE GETTING THE WRONG INFO. WE GOT A VISUAL ON THE RWY AND LANDED WITHOUT A PROB. WHEN I BRIEFED THE APCH WE WERE EXPECTING TO BREAK OUT FOR A VISUAL AROUND THE MARKER BASED ON THE ATIS. I MADE THE MISTAKE OF NOT CHKING THE FINAL APCH COURSE SET AS I USUALLY DO. WE DISCUSSED IT AND FIGURED WE WERE DISTRED FROM THE TURB AND TRYING TO LEAVE THE SEATBELT SIGN OFF A LITTLE LONGER. SUPPLEMENTAL INFO FROM ACN 608732: WE WERE PROBABLY IN THE RWY 35L PATH AT THIS POINT AND HAD BEEN ADVISED OF PARALLEL TFC SO WE WERE AGGRESSIVE TO GET BACK TO OUR SIDE OF THE APCH. WE HAD BEEN GIVEN 190 DEGS TO 10 DME AND BEGAN TO SLOW TO CATCH UP. AT THIS POINT; I REALIZED THE CAPT'S COURSE WINDOW WAS 180 DEGS VICE 350 DEGS AND DIALED THE CORRECT COURSE. WE WERE STILL CORRECTING TO COURSE AND RECEIVED A CALL AFTER CHKING IN WITH TWR THAT WE WERE FULL SCALE TO THE R. WE WERE FULLY CONFIGURED AND IN VMC AND RPTED THIS. THEY ASKED IF THE RWY WAS IN SIGHT AND WE THEN PICKED UP THE RWY THROUGH A LOW CLOUD LAYER AND LANDED. WE WERE DISTRED WITH THE BUMPY RIDE INTO DEN AND LEFT THE PEOPLE UP WHEN IT SMOOTHED OUT AT 13000 FT TO 11000 FT BECAUSE THEY HAD BEEN DOWN THE WHOLE FLT. WE WERE ALSO EXPECTING TO BE VISUAL CONDITIONS AROUND 4000 FT SCATTERED SO THE CAPT WAS EXPECTING VISUAL WITH ILS BACKUP AND WE PROBABLY DIDN'T DO A THOROUGH ENOUGH BRIEF. THE FREQ WAS CORRECT BUT BECAUSE WE WERE TRYING TO GET RE-ESTABLISHED AND I SWITCHED TO RAW DATA IT TOOK A MIN TO CHK THE COURSE. WE WERE IN ICING CONDITIONS AND HAD ENG HEAT ON. ATC SEEMED OK WITH THE EVENT AND LEFT US ON THE APCH BUT IT GOT OUR ATTN IMMEDIATELY BECAUSE IT DIDN'T TAKE MUCH DISTANCE ON PARALLEL APCH TO PUT US CLOSE TO THE OTHER RWY FINAL.