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    <p>Windows Installer is a declarative (vs imperative) programming language. Instead of writing "script" in some language you use table data to express the installation. For example consider the tables:</p> <p>Feature -> Feature Components - Component -Directory</p> <p>Component -> File</p> <p>You are telling MSI that when a given feature is installed, the components that belong to it need to be installed. When the component is installed, a directory needs to be created and a file needs to be copied. If the installer rollsback, the file and directory needs to be removed.</p> <p>This is handled by various standard actions such as CreateFolders and InstallFiles. We don't write any script to accomplish this.</p> <p>But, there is in fact a script. It's generated by Windows Installer itself at runtime. Inside of any standard action that modifies machine state are two different phases:</p> <p>Script Generation - The installer is carefully considering what needs to be done and dynamically generating a list of operations to be performed</p> <p>Script Execution - The installer is now executing that script. Note: This occurs inside of InstallFinalize</p> <p>Log your favorite installer and start looking through it for the InstallFiles action. You'll see the two phases.</p> <p>This is very important stuff to realize when writing your own custom actions. For a lot more information on the subject, see:</p> <p><a href="http://www.installsite.org/pages/en/isnews/200108/" rel="nofollow">Installation Phases and In-Script Execution Options for Custom Actions in Windows Installer</a></p>
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    1. POWhat is an "installation script" in MSI?
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    1. USChristopher Painter
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    1. COThanks a lot! Do you know, in what condition "installation script can be executed outside of the installation session in which it was written"?
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    2. COSure, deferred execution custom actions would be an example. You have an immediate execution that has the ability to query tables, evaluate component action states and create a dataset that gets marshaled over to a deferred custom action. The deferred then processes that dataset (CustomActionData) and only has access to write to the log.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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