Plz hel for file transfer using zmodem protocol

someoe plz help me. i have to devlop an application that transfers files betwn 2 pcs(both ways) using dial up connection, further it should autodial the connection at periodic times.
i am trying to use Zmodem file transfer protocol. i succseed in sending string (for test)using my sender program with hyper terminal open on the other hand. it prints the string. but when i use my receive program, similar to given in samples(simpleread.java) it doesnt work.
actually when the ring comes from the sender how to send command to modem to hang up and connect to the calling pc if there are any such commands then plz help.
----sameer

someoe plz help me. i have to devlop an application
that transfers files betwn 2 pcs(both ways) using dial
up connection, further it should autodial the
connection at periodic times.
i am trying to use Zmodem file transfer protocol. i
succseed in sending string (for test)using my sender
program with hyper terminal open on the other hand. it
prints the string. but when i use my receive program,
similar to given in samples(simpleread.java) it doesnt
work.
actually when the ring comes from the sender how to
send command to modem to hang up and connect to the
calling pc if there are any such commands then plz
help.
----sameerU ddnt abrvt nuf. I r3r1t 4 U.
Sum1 plzz hep m3. i 1/2 2 dvlop app taht xfer fil betwn 2 pcs(bth wys)...

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