Remote control modem including SigMatriX software is a Windows-based software control package for all Sigma routing systems. Communication via a PC's serial port allows the operator full control of up to 8 router levels. Remote control of routers via modem is also supported. Functions include real-time source to destination routing, salvo execution, and event scheduling. Source and destination buttons are organized on the SigMatriX screen in a customizable way that is convenient for the operator. Each button can be given two lines of text and assigned a graphic. A library of graphic images is provided and additional images can be easily added.