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Adding the code in the previous section to your application gives you a quick and easy persistent login There are, however, some important things to note about the code You probably noticed that we actually use two cookies to perform the auth check, auth_ key and username Strictly speaking, this is not necessary if the authentication key is unique across all users For the sake of simplicity, we did not perform a uniqueness check on our auth key, so we must provide another piece of information that is unique In this case, we used the username If you add the code required to ensure uniqueness of the auth key, you can omit the username from the cookies and from the $c->authenticate() call.

The dir Command Windows operating systems allow a user to open a command line interface, a screen that accepts user input in the form of typed commands (see Figure 3-2). You can activate it by typing the word cmd in the Run dialog, which you open from the Windows Start button and the Run menu item. You can also activate it by clicking the Command Prompt icon that appears on the Accessories menu, from the All Programs option.

The ERM diagram, shown in Figure A-1, shows the seven entities (the rounded-corner boxes) with their unique identifiers and their mutual relationships. The ten crow s feet indicate one-to-many relationships. The diagram shows two types of one-tomany relationships: three relationships are completely optional (indicated by all dashed lines) and the remaining ones are mandatory in one direction (indicated by the solid part of the line). Hash signs (#) in front of an attribute mean that the attribute is part of the unique identifier; relationship cross-lines indicate that the relationship is part of the unique identifier. Note that the diagram shows only attributes that are part of unique identifiers, for enhanced readability.

Another thing to note is that since the auth key is not tied to the password, the auth key will permit authorized access to the site even if the user has changed his or her password The primary reason users change their password is that someone learned it or they think that someone might have learned it Since the auth key effectively bypasses the password once the user logs in, it is a good idea to either clear or regenerate the user s auth key whenever the user changes his or her password Finally, it should be noted that while it is difficult to obtain the auth key for a user, if someone does get physical access to the user s computer, the user s auth key could be copied down and then added on a different computer.

Figure A-1. ERM diagram of the case entities You can interpret the relationships in this diagram as follows: Every employee has at most one manager (and employees may have multiple subordinates). Every employee belongs to precisely one salary grade and is employed by at most one department (employees without a department are allowed). Each department has precisely one manager (and employees may be manager of multiple departments). Each course offering refers to precisely one existing course, with at most one employee as trainer. Each registration is for precisely one employee and for precisely one course offering. Each history record refers to precisely one employee and precisely one department.

You use the command dir to list directories and their contents. You can redirect this output to an electronic file, using the dir command s switches. Switches are options added to a command that specify how the command is to be executed. The switch /b uses a bare format that excludes any additional summary information. The switch /s forces the dir command to scan all subdirectories under the current directory. The switch > FileList.txt redirects output to a new file named FileList.txt. The user chooses the actual name of the file; FileList.txt is merely a suggestion. The new file is stored in the parent directory that is to be scanned. The command dir > FileList.txt /b /s creates a FileList.txt text file that contains all directory names and file names of the current directory (see Figure 3-3).