Dial Engine Pro (DEP) is a program for dialing telephone numbers from your Windows PC using supported hardware. It is primarily a commandline tool that allows dialing from other telephony applications and browser plugins; DEP also comes with a Dial Pad interface. After dialing (or redialing busy line) DEP can perform operations such as "drop the line" or "close itself". Phone numbers can be put in the queue and processed sequentially. Being a commanline tool, dialing can be set automatic by using batch files or script.