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Disk Cleanup includes one confusing option that can leave an inordinate amount of wasted space on your hard disk if you don t understand how it works . When you run Disk Cleanup, one of the available options offers to delete Temporary Files; the accompanying Help text explains that these are unneeded files in the Temp folder . Unfortunately, this option may display a value of 0, even if your Temp folder contains hundreds of megabytes of useless files . The reason Although the Help text hints at the answer, it doesn t clearly explain that this value lists only files in your Temp folder that are more than one week old . If you want to completely clean out this folder, you ll need to do so manually . Close all running programs and type %temp% in the Run dialog box; from the resulting Windows Explorer window, delete everything you find . You may discover that some files are not available for deletion until you restart your computer .

The options shown in this dialog box reflect a subset of the total options available, based on the actual contents of the drive you re working with. The wizard performs a bit of triage for you, selecting check boxes next to the categories that it thinks you can part with most easily. The program is reasonably cautious about all of this, leaving, for example, categories such as Previous Windows Installation(s) (if you have any such) and Files Discarded By Windows Upgrade unchecked. Look the list over carefully, select any items about which you re curious and read the descriptions at the bottom of the dialog box for each one, click View Files if you want to see the members of a category, and then click OK to carry out the approved deletions.

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For information about using restore points, see Making Repairs with the Windows Recovery Environment, 24 . For an explanation of how to restore previous versions of files and folders, see Restoring Files and Folders with Previous Versions, 7 .

system. Note that we did not really make any decisions in this simple example. The requirement and capabilities of the remote system mandated the decision for us. In more complex examples, you may need to choose between two viable options. If, for example, the ERP system did support object level integration, you would need to make a decision. Since procedure level integration involves less coupling of the systems, you might choose to stick with the RPC option. The point being that you may have a choice and need to apply judgment after the constraint-based modeling exercise.

The overwhelming majority of Windows users never realize that Disk Cleanup offers several cool switches that are documented only here and in a pair of obscure Knowledge Base articles. Through the use of these switches, you can save your preferences and rerun the cleanup process automatically using those settings. To do so, you need to use the following switches with Cleanmgr.exe:

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/Sageset:n Opens a dialog box that allows you to select Disk Cleanup options, creates a registry key that corresponds to the number you entered, and then saves your settings in that key. Enter a number from 0 through 65535 in place of n. /Sagerun:n Retrieves the saved settings for the number you enter in place of n and then runs Disk Cleanup without requiring any interaction on your part.

To use these switches, follow these steps: 1. Open a Command Prompt window and type the command cleanmgr /sageset:200. (The number after the colon is completely arbitrary; you can choose any other number from 0 through 65535 if you prefer.) You must supply credentials from a member of the Administrators group to begin this task. 2. In the Disk Cleanup Settings dialog box, shown in Figure 20-4, choose the options you want to apply whenever you use these settings. For this example, the options we ve selected include dump files created by Windows Error Reporting, Temporary Files, Temporary Windows Installation Files, and Thumbnails.

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XML is arguably the most important development in systems integration in the past twenty years. The ability to generically describe, manipulate, and transform data is allowing all types of enterprise systems to be connected in ways never before possible. In this section, we examine the ways XML can enhance J2EE systems integration in each of the four patterns described in section 4.1.1. As you will see, XML technology provides most of its value at the message and procedure level, but can be used in specialized ways at the data and object integration levels as well.

Figure 20-4 When you use the /Sageset switch, you can work with an expanded set of options that are not a ailable interacti ely.

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