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Contains all of the user profiles on the computer The HKEY_CURRENT_USER key is a subset of the HKEY_USERS key Contains all of the configuration information that is unique or particular to the computer Is a subset of HKEY_LOCAL_MACHINE and stores information related to applications, Windows Explorer, and settings Contains information that is used for startup

Now that we ve created the PHP script dataresponderphp, creating a PHP script that you can POST to is easy All you have to do is to change the $_GET array in dataresponderphp,

Each of these keys can contain thousands of values that can be individually altered to troubleshoot or configure settings on your computer Great places to get additional information on the Registry are the Microsoft website (wwwmicrosoftcom) and the WinGuides site (wwwwinguidescom) Do not use the Registry editor unless absolutely no alternative exists Improperly altering Registry keys can render your system inoperable Virtually all administrative applications handle Registry key management for you

< php if ($_GET["data"] == echo 'You sent the } if ($_GET["data"] == echo 'You sent the } > "1") { server a value of 1'; "2") { server a value of 2';

Larger operating systems such as the Windows family usually require more memory than is physically installed on the computer Virtual memory implementations allow for a portion of the disk to be accessed as memory This allows extremely large files and applications to be loaded into memory and pulled in from virtual memory when needed, which improves system performance by not requiring large programs to be broken down into smaller sections and individually loaded When needed information is swapped in and out of disk in pages or blocks of memory From the disk drive Virtual memory makes it possible for Windows OSes to support multitasking applications, which means the operating system can run more than one application or utility at once This feature is very handy if you are using information from one application to create a file in another As you can see in Figure 8-5, the taskbar shows that the computer is running Microsoft Notepad and Internet Explorer Users can switch back and forth between these applications and work on more than one file at a time, improving productivity This has become the standard way of operation for most computer users Virtual memory environments run slower than purely real memory environments, but it does allow multitasking to be viable Almost all modern operating systems extensively use virtual memory to enhance usability of the system In most cases, the operating system will calculate and allocate the optimal amount of disk used for virtual memory

FIGURE 8-5

to the $_POST array in a new PHP script, dataresponderpostphp:

Windows operating systems use a hierarchical storage method based on folders and files Files are individual programs or data that is stored on disk Folders are an organizational tool that groups files together based on criteria established by the user or the operating system Figure 8-6 uses Windows Explorer to show a sample of a Windows XP file system The file system can be accessed either on the desktop or by using file management tools provided by the operating systems These are covered in more detail in the Disk Management section of this chapter File systems are established when the operating system or a new disk is installed on a computer system There are a number of different file system implementations that are described in the Disk Management section of this chapter Windows OSes use My Computer and Windows Explorer as the preferred method by Microsoft to view, move, rename, copy, or delete files and folders When files are deleted, they are placed in the Recycle Bin by default Files are not actually deleted from the system, however; they can be recovered from the Recycle Bin until you

< php if ($_POST["data"] == "1") { echo 'You sent the server a value of 1'; } if ($_POST["data"] == "2") { echo 'You sent the server a value of 2'; } >

8:

3:

FIGURE 8-6