CL65 WAS ISSUED ATC GAR WHEN AMASS ALARMED AFTER ACFT TAXIING HAD EXITED LNDG RWY.

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WE NOTICED A SNOW SQUALL BLOCKING OUR VIEW OF THE ARPT AS WE WERE BEING VECTORED FOR THE ILS RWY 27 APCH AT BOS. WHEN CLRED FOR THE APCH; THE SQUALL WAS OVER THE ARPT AND STILL BLOCKING OUR VIEW OF THE RWY. LOGAN TWR CLRED US TO LAND AND ADVISED US THAT HE HAD ACFT BACK-TAXING EBOUND ON RWY 27. AS WE CAME OUT OF THE BACK SIDE OF THE SQUALL; WE SAW THAT ONE OF THE ACFT WAS A B747. ONE OF THE ACFT SEEMED TO BE HAVING SOME KIND OF DIFFICULTY. THESE ACFT FINALLY CLRED RWY 27 AT TXWY C HEADING OVER TOWARDS THE DEP END OF RWY 33L. WE ARE NOW ON FAIRLY SHORT FINAL. TWR DECIDES TO TAXI AT LEAST 1; MAYBE 2 ACFT ACROSS RWY 27 AT TXWY C. AS THE LAST ACFT CLRED; TWR TOLD US THAT THE COMPUTER WAS TELLING HIM TO SEND US AROUND. HE ALSO TOLD US THAT THE SITUATION WAS FINE FOR HIM BUT HE HAD TO SEND US AROUND BECAUSE THE COMPUTER WAS TELLING HIM THAT. I HAVE NO IDEA WHAT COMPUTER HE WAS REFERRING TO IN HIS STATEMENT. WE EXECUTED THE GAR AND CAME BACK FOR ANOTHER ILS RWY 27 APCH WHICH WAS COMPLETED WITH NO FURTHER PROBS. I BELIEVE WE HAD TO DO THE GAR UNNECESSARILY BECAUSE THE CTLR WAS TRYING TO DO TOO MANY THINGS WITH NOT ENOUGH ROOM TO ACCOMPLISH WHAT HE WANTED TO DO.