A TAXIING MD88 CROSSES RWYS 9 AND 4L ON THE TAXI OUT; EXPECTING RWY 4L AT BOS; MA.

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PUSHBACK CLRNC WAS REQUESTED FROM ZBW AND RECEIVED. ALSO; A REQUEST WAS MADE FOR RWY 4R OR RWY 4L INSTEAD OF RWY 9 DUE TO WT CONSIDERATIONS. ZBW ADVISED TO EXPECT RWY 4R. AFTER PUSHBACK FROM GATE; TAXI INSTRUCTIONS WERE REQUESTED AND RECEIVED FROM GND CTL. WE WERE INSTRUCTED TO TAXI VIA TXWY A; TXWY C; GIVE WAY TO AN INBOUND ACR ACFT; TXWY K; TXWY B. WE PROCEEDED AS DIRECTED. THERE WAS SOME CONFUSION ON OUR PART AS TO WHEN TO CONTACT THE TWR CTLR. WHEN CONTACT WAS MADE THE TWR ADVISED US WE HAD CROSSED RWY 4L WITHOUT CLRNC. THERE WAS NO CONFLICT WITH ANY OTHER ACFT AND THE CTLR DID NOT SEEM UPSET WITH OUR ACTIONS. THE REST OF THE TKOF AND DEP WAS UNEVENTFUL. THERE WAS A DISTR THAT COULD HAVE CONTRIBUTED TO OUR MISSING THE TXWY B HOLD POINT; WHERE RWYS 9 AND 4L INTERSECT. A B747 WAS PARKED IMMEDIATELY NEXT TO TXWY B WITH EXTREMELY BRIGHT LIGHTS ILLUMINATING THE ACFT. THE LIGHTS POSITIONED BEHIND THE B747 POINTING FORWARD SHINED VERY BRIGHTLY ON OUR ACFT AND MADE VISIBILITY OUTSIDE THE COCKPIT DIFFICULT FOR A FEW MOMENTS; POSSIBLY CAUSING US TO MISS THE TXWY B HOLD POINT SIGNAGE.