In Visual Studio, you can draw a use case diagram to summarize who uses your application or system, and what they can do with it. To create a UML use case diagram, on the Architecture menu, click New UML or Layer Diagram.For a video demonstration, see Organizing Features into Use Cases.To see which versions of Visual Studio support this feature, see Version support for architecture and modeling tools.With the help of a use case diagram, you can discuss and communicate:The scenarios in which your system or application interacts with people, organizations, or external systems.The goals that it helps those actors achieve.The scope of your system.A use case diagram does not show the detail of the use cases: it only summarizes some of the relationships between use cases, actors, and systems. In particular, the diagram does not show the order in which steps are performed to achieve the goals of each use case. You can describe those details in other diagrams and documents, which you can link to each use case. For more information, see Describing Use Cases in Detail in this topic.The descriptions you provide for use cases will use several terms related to the domain in which the system works, such as Sale, Menu, Customer, and so on. It is important to define these terms and their relationships clearly, and you can do that with the help of a UML Class Diagram. For more information, see UML Class Diagrams: Guidelines.Use cases deal only in the functional requirements for a system. Other requirements such as business rules, quality of service requirements, and implementation constraints must be represented separately. Architecture and internal details must also be described separately. For more information about how to define user requirements, see Model user requirements.The examples used in this topic relate to a Web site on which customers can order meals from local restaurants.Elements in a use case diagramAn actor (1) is a class of person, organization, device, or external software component that interacts with your system. Example actors are Customer, Restaurant, Temperature Sensor, Credit Card Authorizer.A use case (2) represents the actions that are performed by one or more actors in the pursuit of a particular goal. Example use cases are Order Meal, Update Menu, Process Payment.On a use case diagram, use cases are associated (3) with the actors that perform them.Your system (4) is whatever you are developing. It might be a small software component, whose actors are just other software components; or it might be a complete application; or it might be a large distributed suite of applications deployed over many computers and devices. Example subsystems are Meal Ordering Website, Meal Delivery Business, Website Version 2.A use case diagram can show which use cases are supported by your system or its subsystems.
The user cannot close all the programs if he closes the open virtual desktop.
<h3>What are virtual desktops?</h3>
A virtual desktop is a computer operating system that does not run directly on the endpoint hardware from which a user accesses it. The desktop environment is separated from the physical device used to access it.
I call it a false desktop.
It is use to separate your work activities.
Therefore, the user cannot close all the programs if he closes the open virtual desktop.
RADIUS as developed with the idea of allowing its users or clients to be able to authenticate to a dial-in access server. So basically it is a client server protocol and he client here is the firebox and the server is the RADIUS server.
The authentication mechanism start by user who sends a message to the RADIUS server. Then the RADIUS server upon receiving the message accept or denies it. It accepts if the client is configured to the server.
A large amount of additional information can be sent by the RADIUS server in its Access-Accept messages with users so we can say that RADIUS is uitable for what are called "high-volume service control applications" such as dial-in access to a corporate network.
Option E Components that interact to produce information
Explanation:
Information system is a system to collect, analyze and disseminate information. An information system consists of five components that work with each other to produce information:
Computer hardware - physical machine that works with information
Computer software - a set of computer instructions that tell computer hardware how to perform a task
Telecommunications - components that connect a group of hardware as to establish a network. This usually includes WiFI technology.
Databases and data warehouses - the place where the digital data are kept and retrieved.
Human resources and procedures - human expertise that run the system by following some standard procedures.
