B737 CREW WAS NOT ADVISED OF LAHSO OPS BEING CONDUCTED AT BOS.

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I WAS FLYING CAPTAIN ON AN ACR #Y FLIGHT DCA TO BOS ON JULY XA 00. LAHSO OPS WERE ON THE ATIS. DURING OUR LNDG ROLL ON RWY 27; MY FO ADVISED ME THAT THERE WAS AN ACR X B757 ON RWY 22L. AT THIS TIME WE DID NOT KNOW IF ACR X FLIGHT WAS TAKING OFF; LNDG; OR LNDG HOLDING SHORT OF RWY 27. WE WERE NOT ADVISED BY BOSTON TWR OF TRAFFIC LNDG RWY 22 HOLDING SHORT OF RWY 27. AT THIS TIME ALL I COULD DO WAS INCREASE BRAKING TO STOP PRIOR TO RWY 22. THIS WAS ACCOMPLISHED SAFELY BECAUSE WE WERE VERY LIGHT; HAD THIS BEEN A FULL FLIGHT IT WOULD HAVE BEEN IMPOSSIBLE. AFTER LNDG; WE WERE INSTRUCTED TO SWITCH TO A DIFFERENT TWR FREQ 128.8 AND HOLD SHORT OF RW 22L. WHEN WE SWITCHED WE HEARD THE TWR ASK ACR X IF THEY COULD MAKE THE TURN PRIOR TO RWY 27. AT THIS TIME; WE QUESTIONED IF ACR X WAS ADVISED OF TRAFFIC ON 27 OR IF THEY WERE ADVISED TO HOLD SHORT OF RWY 27. AFTER THE FLIGHT; I CALLED THE TWR AND ASK THEM TO MARK THE TAPES. THEY ADVISED ME LAHSO OPS WERE ON THE ATIS. THEY SAID THEY WOULD REVIEW THE TAPES AND I WOULD CALL BACK AT XA00 WHEN I CALLED BACK THEY SAID ACR X OR ACR Y WERE NOT ADVISED OF LAHSO OPS BY BOSTON TOWER. I FEEL LAHSO OPS HAVE A LOT OF INHERENT PROBLEMS. THE PROBLEMS AT BOSTON ARPT WAS UNAVOIDABLE BECAUSE OF THE DIFFERENT TWR FREQS FOR CROSSING RWYS. BOSTON TWR FORGOT TO TELL US ABOUT ACR X ON RWY 22 AND WE FOUND OUT LATER ACR X WAS NOT ADVISED OF US ON RWY 27 BECAUSE OF DIFFERENT TWR FREQ ON CROSSING RUNWAYS.