The mfdepinst command handles the server-side part of the process of deploying a service to enterprise server. The tool installs the services contained in a .car onto the enterprise server. It is the equivalent of unpacking the .car file manually and adding the files using Enterprise Server Administration.
The mfdepinst command extracts the files (.int, .idt, and so on) from the .car file, updates the Directory Service directory for the new services and packages, and if the enterprise server is running tells it about the new services so they are available for use.