@ECHO OFF
COPY XFER-%2.DEF XFER-%2.BK1
DEL XFER-%2.DEF
BIMODEM.COM /B %1 /D %3
COPY XFER-%2.DEF XFER-%2.BK2
COPY XFER-%2.BK1 + XFER-%2.BK2 XFER-%2.DEF