zxing barcode scanner c# 12: Understanding Windows in Software

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12: Understanding Windows
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connected to a workgroup but not a domain, run in a specialized networking mode called simple file sharing A Windows XP system running simple file sharing has only three account types: Computer Administrator, Limited User, and Guest Computer Administrators can do anything, as you might suspect Limited Users can access only certain things and have limits on where they can save files on the PC NTFS Permissions In the 2000/XP world, every folder and file on an NTFS partition has a list that contains two sets of data First, the list details every user and group that has access to that file or folder Second, the list specifies the level of access that each user or group has to that file or folder The level of access is defined by a set of restrictions called NTFS permissions NTFS permissions define exactly what a particular account can or cannot do to the file or folder on an NTFS volume and are thus quite detailed and powerful You can make it possible, for example, for a person to edit a file but not delete it You can let someone create a folder and not allow other people to make subfolders NTFS file and folder permissions are so complicated that entire books have been written on them! Fortunately, the CompTIA A+ certification exams test your understanding of only a few basic concepts of NTFS permissions: Ownership, Take Ownership permission, Change permissions, Folder permissions, and File permissions
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Ownership When you create a new file or folder on an NTFS partition, you become the owner of that file or folder A newly created file or folder by default gives everyone full permission to access, delete, and otherwise manipulate that file or folder Owners can do anything they want to the files or folders they own, including changing the permissions to prevent anybody, even administrators, from accessing them Take Ownership permission This special permission enables anyone with the permission to seize control of a file or folder Administrator accounts have Take Ownership permission for everything Note the difference here between owning a file and accessing a file If you own a file, you can prevent anyone from accessing that file An administrator who you have blocked, however, can take that ownership away from you and then access that file! Change permissions Another important permission for all NTFS files and folders is the Change permission An account with this permission can give or take away permissions for other accounts Folder permissions Let s look at a typical folder in my Windows XP system to see how this one works My E: drive is formatted as NTFS, and on it I created a folder called E:\MIKE In My Computer, it looks like Figure 1280 I set the permissions for the E:\MIKE folder by accessing the folder s properties and clicking the Security tab (see Figure 1281) File permissions File permissions are similar to Folder permissions We ll talk about File permissions right after we cover Folder permissions
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Mike Meyers CompTIA A+ Guide: Essentials (Exam 220-601)
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Figure 1281 Figure 1280
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My E:\MIKE folder isn t it lovely
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The Security tab lets you set permissions
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In Windows 2000/XP, just about everything in the computer has a Security tab in its properties, and every Security tab contains two main areas The top area shows the list of accounts that have permissions for that resource The lower area shows exactly what permissions have been assigned to the selected account Here are the standard permissions for a folder:
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Full Control
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Modify Enables you to do anything except delete files or subfolders Read & Execute any subfolders Enables you to see the contents of the folder and
List Folder Contents Enables you to see the contents of the folder and any subfolders (This permission seems the same as the Read & Execute permission, but it is only inherited by folders) Read Write Enables you to read any file in the folder Enables you to write to files and create new files and folders
If you look at the bottom of the Security tab in Windows 2000, you ll see a little check box that says Allow Inheritable Permissions from Parent to Propagate to This Object In other words, any files or subfolders created in this folder get the same permissions for the same users/groups that the folder has Unchecking this option enables you to stop a user from getting a specific permission via inheritance Windows XP has the same feature, only it s accessed through the Advanced button in the Security tab Windows also provides explicit Deny functions for each option (Figure 1282) Deny overrules inheritance
Don t panic about memorizing special permissions; just appreciate that they exist and that the permissions you see in the Security tab cover the vast majority of our needs
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