FLC OF A B737 TAXIED ONTO RWY AND STARTED TKOF ROLL AND SUBSEQUENTLY STOPPED AND HELD AFTER OBSERVING A DEHAVILLAND DASH 8 ON THE RWY AHEAD STARTING TKOF.

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THE FAA ALLEGES A GND MOVEMENT DEV OCCURRED AT BOISE ARPT; ID; IN VMC CONDITIONS ON APR/XA/99. AFTER PUSHBACK FROM GATE X; WE RECEIVED TAXI CLRNC TO RWY 28R VIA TXWYS D AND A. BEFORE TURNING ONTO TXWY A; WE WERE TOLD BY GND CTL TO EXPEDITE OUR TAXI BECAUSE A DASH 8 WAS TO FOLLOW US OUT. WE HAD IT IN SIGHT ALREADY ON TXWY A AND PROCEEDED TO TAXI ONTO TXWY A IN FRONT OF IT. ONCE CLR OF THE TFC AREA; I PUSHED OVER TO TWR FREQ. NEARING THE END OF TXWY A; THE TWR GAVE US TKOF CLRNC; 'ACR X; CLRED FOR TKOF RWY 28R; FLY RWY HDG.' I REPEATED ALL OF THE CLRNC BACK TO TWR. WE THEN TURNED ONTO THE RUNUP AREA PERPENDICULAR TO THE RWY. IT WAS MY LEG; SO AS WE WERE TURNING ONTO THE RWY; THE CAPT GAVE ME THE THRUST LEVERS. I LOOKED DOWN THE RWY AND SAW A DASH 8 IN POS ON THE RWY ABOUT 3000-4000 FT DOWN OR JUST PUSHING UP PWR FOR TKOF. I PULLED THE THRUST LEVERS BACK AND STOPPED WHILE THE CAPT ASKED TWR IF WE WERE CLRED FOR TKOF. THE TWR SAID NEGATIVE AND TO HOLD IN POS. ALL DURING THIS TIME; ON GND AND TWR FREQS; WE NEVER HEARD THE DASH 8 WHO WE LATER LEARNED WAS ACR Y. TWR THEN HAD THE CESSNA ON FINAL TO RWY 28R GO AROUND. THE CAPT HAD SEEN THE CESSNA ON FINAL ABOUT 3 MI OUT BEFORE WE TOOK THE RWY. WITHIN 1 MIN WE WERE CLRED FOR TKOF AND DEPARTED. NEITHER TWR NOR DEP SAID ANYTHING ABOUT IT OR ASKED TO CALL THEM. WE WANTED TO FIND OUT WHAT HAPPENED SO THE CAPT GOT THE TWR'S PHONE NUMBER FROM COMPANY TO CALL AFTER ARRIVING IN LAS. ON ARR; THE FO HAD THE MESSAGE TO CALL BOISE TWR. THE CAPT SPOKE TO MR X WHO SAID THAT A GND MOVEMENT DEV WAS BEING FILED. HE SAID THEY NEVER HEARD MY ACKNOWLEDGEMENT FOR TKOF CLRNC. IT IS HARD TO BELIEVE MY RADIO XMISSION WAS AT THE SAME EXACT TIME AND DURATION AS ACR Y SINCE WE DID NOT HEAR ACR Y AND THE TWR DID NOT HEAR US. ALSO; THAT WE HEARD NOTHING ABOUT ACR Y TAKING THE RWY FOR AN INTXN TKOF AND NOT BEING BEHIND US STILL.