/dir:<directory 1>,<directory N>
Instead of having script/assembly probing directories specified in global config file (css_config.xml) you can add them only for a particular script execution. This can be achieved by specifying /dir switch:
The command above executes the myScript.cs script. It also instructs the script engine to include C:\MyLibraries in script/assembly probing.
Command-line interface | Using .NET assemblies