It is possible to forward parameters from the command line to GroIMP using additional parameters beginning with an capital X.
This parameter can than be accessed by all models opened.
For a model that is suppose to greed the user this additional parameter could be the name, therefore the command line parameter would be ''-Xname="gaetan"''.
To access this parameter than in GroIMP the function getProperty of the class Main needs to be called:

<code java>
import de.grogra.pf.boot.Main;

public void sayHi(){
  println("hallo "+Main.getProperty("name"));
}

</code> 

This works with multiple parameters and is especially useful in the [[groimp-platform:interfaces:headless|headless mode]]:

<code java>
import de.grogra.pf.boot.Main;
protected void startup()
{
	super.startup();
	if (Main.getProperty("headless") != null)
	{
		runLater(null);
	}
}


protected void run(Object info)
{
	println("hallo " + Main.getProperty("name"));
}
</code>

This provides the possibility to forward knowledge/information or the path to specific configuration to a GroIMP model without changing the model.