i need help on send data with modem

Hi , I need some help, write program to send data between two computer with modem... each computer has a separate phone line
please , thank you ..

Generally speaking, you'd get both computers to dial in to an Internet service provider, and then use normal TCP/IP sockets for communication. If you need to go to a lower level than that with Java, you probably need something that would wrap your modem driver with a Java interface, or (ugh) write such an interface yourself.