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If you had to hold up processing every time you needed a value back from a remote method, you d require a Herculean effort just to decide when and when not to use a method Not only can you retrieve a value from an asynchronous call if you need it, but there are several ways to accomplish the retrieval We saw in 7 that to use an IAsyncResult object to perform an asynchronous invocation, a delegate object that matched the method s signature was necessary After this matching delegate was in place, all that was necessary to perform the asyn chronous invocation was calling the BeginInvoke method of the delegate, passing in the function s name, and in our example, two null parameters.

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In the simplest asyn chronous return value retrieval scenario, all that is necessary is to call the EndInvoke method of the delegate, passing in the IAsyncResult object as a parameter Assuming the same implementation of IPerson and Person that was used in the first example in Lesson 1, all that is needed to get the return values from FirstName and LastName is the following modification (new code is highlighted in bold):.

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Off the Record Key archival provides an example of how the role separation between CA Administrator and Certificate Manager provides separation of duties. When key archival is used, the copy of the private key is encrypted and the key blob (the encrypted key) is stored in the CA database. Only the Certificate Manager can retrieve this blob, but only the valid Key Recovery Agent can decrypt the key data. This is an example of separation of duties. The Key Recovery Agent role is not a CA administrative role, but it is important to proper CA function ing. The Key Recovery Agent cannot, on his own, retrieve user keys and decrypt them. The Certificate Manager can retrieve the key blob but cannot decrypt it. Thus either, on his own, cannot obtain and use private keys that belong to others. One would have to be in cahoots with the other, a situation that is not likely to happen.

Sub Main() RemotingConfiguration.Configure("StandardClient.exe.config", False) Dim person As IPerson = _ CType(Activator.GetObject(GetType(IPerson), _

HKCU contains the console user's per user settings This root key is a link to HKU\SID, where SID is the console user's security identifier This branch includes environment variables, desktop settings, network connections, printers, and application preferences Here's a snapshot of some of this root key's subkeys: AppEvents Associates sounds with events For example, it associates sounds with opening menus, minimizing windows, and logging off Windows XP Console Stores data for the console subsystem, which hosts all character mode applications, including the MS DOS command prompt In addition, the Console key can contain subkeys for custom command windows Control Panel Contains accessibility, regional, and desktop appearance settings You configure most of these settings in Control Panel However, this key contains a handful of useful settings that have no user interface; you can configure them only through the registry Environment Stores environment variables users have set.

"tcp://localhost:9000/Person.rem"), IPerson) Dim first_name As New FirstNameDelegate(AddressOf person.FirstName)

You assign the CA Administrator and Certificate Manager roles by giving the Security permission to the Windows group you have created for this purpose. Follow these guidelines for using CA administrative roles:

Dim last_name As New LastNameDelegate(AddressOf person.LastName)

Assign these permissions to a group rather than to a user. Remove CA-specific roles from the Administrators group.

Dim FirstNameResult As IAsyncResult = _

Assign trusted users to fulfill the roles. When designing the use of CA administra tive roles, remember their purpose: separation of roles and increased security of operations. The difficulty in implementing roles to fulfill these purposes is the inconvenience and the need in smaller organizations to identify sufficiently trusted individuals to perform the roles. It does no good to require role separation and then give the trusted role to someone who has not earned that trust. Enable role separation:

Each value associates an environment variable with the string that Windows XP substitutes for the variable The default values for these entries are in the user's profile Identities Contains one subkey for each identity in Microsoft Outlook Express Outlook Express uses identities to allow multiple users to share a single mail client With Windows XP's support for user profiles, one user's settings are separate from other users' settings, so this key is seldom necessary Keyboard Layout Contains information about the installed keyboard layouts Network Stores information about mapped network drives Each subkey in Network is a mapped drive to which Windows XP connects each time the user logs on to the computer The subkeys' names are the drive letters to which the drives are mapped Each drive's key contains settings used to reconnect the drive Printers Stores user preferences for printers Software Contains per user application settings.

first_name.BeginInvoke(Nothing, Nothing)

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