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Verify that the Enable Broadcast Name Resolution option is selected on the IP tab of the server properties dialog box. This step is necessary only if your remote network uses NetBIOS name resolution, does not use WINS, and your remote access clients are located on the same logical subnet as the NetBIOS services to which they will connect.

// Create a reference initialized to null o = null; // "Unbox" it into a Nullable<Int32> and into an Int32 a = (Int32 ) o; // a = null b = (Int32) o; // NullReferenceException

Using the Routing And Remote Access console, you can view currently connected remote access clients in the details pane by selecting the Remote Access Clients node in the console tree. You can then manage these clients by viewing their status, discon necting them, or sending a message to one or all of them. The following procedures describe how to perform each of these four functions. To view connected remote access clients, complete the following steps: 1. Open the Routing And Remote Access console. 2. In the console tree, click the Remote Access Clients node. 3. In the details pane, right-click a user name, and then click Status. To disconnect a remote access client, complete the following steps: 1. Open Routing And Remote Access. 2. In the console tree, click the Remote Access Clients node. 3. In the details pane, right-click a user name, and then click Disconnect. To send a message to a single remote access client, complete the following steps: 1. Open Routing And Remote Access. 2. In the console tree, click the Remote Access Clients node. 3. In the details pane, right-click a user name, and then click Send message. 4. In Send Message, type your message, and then click OK. To send a message to all remote access clients, complete the following steps: 1. Open Routing And Remote Access. 2. In the console tree, right-click the Remote Access Clients node. 3. Click Send To All. 4. In the Send Message dialog box, type your message, and then click OK.

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When calling GetType on a Nullable<T> object, the CLR actually lies and returns the type T instead of the type Nullable<T> . Here is some code that demonstrates this behavior:

Authorizing Remote Access Connections 10-43

C#'s support for unsafe code is the language's most significant divergence from Java. Unsafe code provides access to pointer data types and allows the programmer to work directly with the contents of memory. Unsafe features can be dangerous, are rarely needed, and should be avoided if possible. However, unsafe code is required when calling pre-.NET dynamic-link libraries (DLLs) that take pointers as arguments.

Besides being able to manage currently connected clients, you can also manage remote access clients in general by defining rules through remote access policies. For example, you can manage clients by restricting idle time, connection time, or access to specific parts of your internal network. You can configure these restrictions through a policy profile and apply them to any client type.

Int32 x = 5; // The line below displays "System.Int32"; not "System.Nullable<Int32>" Console.WriteLine(x.GetType());

In this practice, you create a domain user account and a corresponding remote access policy. You then dial in with the user account to test the configuration.

The unsafe features described in this section are available only within an unsafe context, declared using the unsafe modifier. The unsafe modifier is applicable to the declaration of classes, structs, interfaces, delegates, fields, methods, properties, events, indexers, operators, constructors, destructors, and statement blocks. The presence of the unsafe modifier in the declaration of these program elements signals to the compiler that the element contains unsafe code. The unsafe modifier is not applicable to local variables; they must be used within the unsafe context of one of the program elements previously mentioned.

In the code below, I m casting n, a Nullable<Int32>, to IComparable<Int32>, an interface type . However, the Nullable<T> type does not implement the IComparable<Int32> interface as Int32 does . The C# compiler allows this code to compile anyway, and the CLR s verifier considers this code verifiable to allow you a more convenient syntax .