I am doing a project on visual c++, which is intented for the transfering of file between two computers. Here i use microsoft's Telephony API (TAPI) for establishing connection between two system. Instead of using the IP address we connect two computers by means of normal dialup connection ( simply by dialing a phone number ). The steps for dialling a phone number,taking the incomming call is over.The problem is now at the place for sending a file through this TAPI established connection.Because i can't get the right handle for modem/comm port. Can u suggest some valuable advice to getting the handle for communication. We are using zmodem for the purpose of sending files through the TAPI enabled connection.Can u provide some source code for transfering of files using TAPI connection.