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The first of these is usually no more than a minor annoyance. The second can be more vexatious, but it usually only arises with programs designed for an earlier generation of operating system. In this chapter, we ll survey the hoops and hurdles and everything else having to do with the addition, removal, updating, and management of applications in Windows Vista.

These approaches range from each tenant having a separate schema, to providing a set of pre-defined custom columns, to more flexible schemas that enable a tenant to add an arbitrary number of custom fields to a table If you use SQL Azure, much of the application s complexity will result from having to work within the constraints of fixed data schemas If you are using Windows Azure table storage, the complexity will arise from working with variable schemas Windows Azure table storage allows records in the same table to have completely different structures, which allows for a great deal of flexibility at the cost of more complexity in the code Custom extensions to the application s data model should not require changes to application code.

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The Group Policy Editor, discussed in Managing Startup Programs, later in this chapter, is not available in Windows Vista Home Basic or Windows Vista Home Premium. Everything else in this chapter applies equally to all editions.

4

Dealing with User Account Control (UAC)

Occasional exceptions aside, the rule in Windows Vista is: To install a program, you need administrative credentials. Software installers the programs that install programs typically create files in system folders (subfolders of %ProgramFiles%) and keys in protected registry locations, and these are actions that require elevated privileges. Installing the program files and registry keys in protected locations protects your programs (hence, you) from tampering by malicious parties, but it means that you need to deal with User Account Control prompts to complete the process. If you install a program while running under an administrative account, a UAC prompt will request your consent for the actions the installer is about to undertake. If you install while running under a standard account, you will be asked to supply the name and password of an administrative user.

A.2.2

For more information about User Account Control, see Preventing Unsafe Actions with User Account Control, in 10.

Windows Vista employs installer detection technology to determine when you have launched an installation process. This technology enables the operating system to request credentials at the time the process is launched, rather than waiting until the installer actually attempts to write to a protected location. The system presumes that any process with a filename containing particular keywords (such as install, setup, or update) or any process whose data includes particular keywords or byte sequences, is going to need elevated privileges to complete its work, and so the UAC prompt appears as soon as the installer process begins. After you have satisfied the UAC mechanism, the process runs in the security context of TrustedInstaller, a system-generated account that has access to the appropriate secure locations.

4

Dealing with User Account Control (UAC)

If installer-detection technology fails to detect your installer, and if your installer tries to write to a protected area (in le storage or the registry), your setup will fail typically with an error message like this:

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