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The peer model In this architectural model, independent processes collaborate to perform some task in a coordinated fashion The peer approach is common in situations where either a lot of computing power is needed to perform an intense calculation or where independent systems need to guarantee that synchronized states are maintained Any system that is transactional makes use of this model for at least part of its functionality The peer model treats all processes as equals, although it often requires one of them to act as a group coordinator An example of a peer processing situation in scientific applications is gene sequencing; a business processing example is executing a distributed purchasing transaction In these situations, each process calculates part of some result and contributes it to the whole.

LiteralControl equiv; equiv = new LiteralControl ( <meta http-equiv= refresh content= 3 /> ) ((Control) Header).Controls.Add(equiv);

When you operate applications in server farms, you should configure a number of modifications Because HTTP is a stateless protocol, it is necessary to carry session state information either in the URL or in a cookie (Recall the earlier discussion of how to configure Forms Authentication to store its authentication state in either a cookie or the query string portion of the URL) Much of the information in this state, however, needs to be encrypted and/or validated, which requires keys to be used by the Web server If an encrypted or validated cookie or URL is set at one server, and then fed back as session state to another server, the request will be incomprehensible or invalid if the two servers do not share the same encryption key By default, ASP.

To link a stylesheet file, you use the following code:

NET machine keys are automatically generated when the application starts, and each application gets its own machine key (so that in a shared hosting environment, one application cannot accidentally access another application s session state) In a Server Farm environment, then, the machine key needs to be shared This is accomplished by using the ASPNET Machine Keys feature, and clearing the Automatically Generate At Run Time boxes At one computer in your server farm, you will then click Generate Keys to put a new, random machine key into the encryption and validation boxes You can then copy and paste these key settings into the other computers in your server farms If you are managing a large server farm, or if you will be frequently cycling your Machine Key, you should automate this feature, which you can do through WMI or by directly modifying the Web site s web.

For example, as a customer places an order, a pricing process calculates a specific customer s price for each item on an order and adds those prices to the order information J2EE supports peer processing via the Java Transaction Architecture (JTA) API Using this API, your components can interact in a scoped, coordinated way with each other and with external systems JTA is one of the many J2EE APIs available to you, and transactional support is one of the key features of any J2EE EJB container Merging the client/server and peer models There is no reason the client/server and peer models cannot coexist in the same system In practice, most substantial systems manifest traits of both the client/server and peer processing models For example, figure 15 shows a web client invoking an e-commerce service provided by a merchant server to place an order for a product.

Header.LinkedStyleSheets.Add( MyStyles.css );

config file, as shown in the following example Note that the validation key should be a randomly generated, 40-128 character hexadecimal string, representing a 20-64 byte random sequence and the decryption key should be a hexadecimal string 16 characters in length when using DES encryption and 48 characters in length when using Triple-DES encryption..

<configuration> <system.web> <machineKey decryptionKey= E91D...7DB3,IsolateApps validationKey= 215C...528E,IsolateApps />

Finally, the HtmlHead control features the Title property, through which you can retrieve and set the title of the page.

The e-commerce server accepts the request and connects to the back-end fulfillment system as a client The fulfillment system in turn collaborates with the pricing and inventory systems to complete the.