public abstract Listener Listen(
	string spaceName,
	Listener listener,
	string filter
)

Public MustOverride Function Listen ( 
	spaceName As String,
	listener As Listener,
	filter As String
) As Listener

public:
virtual Listener^ Listen(
	String^ spaceName, 
	Listener^ listener, 
	String^ filter
) abstract

abstract Listen : 
        spaceName : string * 
        listener : Listener * 
        filter : string -> Listener