The Media Control Interface (MCI) is a facility provided by the operating system that provides programs with device-independent capabilities for controlling audio and visual peripherials. FMSLogo gives your Logo programs full access to this powerful facility through the MCI command.

MCI is too rich and too complex to fully document here. Instead, we give a brief overview of the core MCI concepts and examine some sample procedures for performing common tasks. For a complete reference on MCI, search for "Media Control Interface" on https://docs.microsoft.com. As you read through the official reference manual, keep in mind that FMSLogo programs access MCI through its "command string" interface, not its "command message" interface.