Made a dial-up, fax comm3 cat on after connecting, the code set up MSComm1.Com mPort=3 MSComm1. PortOpen=True and open communication port, on the first computer called the normal to change a computer, fax cat with after see in modem connection or comm3, but to run the program prompts invalid port, try to fax the cat port to comm5, code is changed to MSComm1.Com mPort=5, or prompt invalid ports, switch back to the first computer can still run normally, please god help me, going crazy, check the device manager, check the registry, code has added criterion whether open, everything is normal, the first computer still second, beg a great god, teacher, going crazy ~ ~ ~ ~ ~