Public Delegate Sub MessageReceivedHandler( _
	ByVal sender As Object, _
	ByVal message As LegoMessageWrite _
)

public delegate void MessageReceivedHandler(
	object sender, 
	LegoMessageWrite message
);

public __gc __sealed __delegate void MessageReceivedHandler(
	Object sender, 
	LegoMessageWrite message
);

In JScript, you can use the delegates in the .NET Framework, but you cannot define your own.