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Not to put too fine a point on it, but this was a wretched state of affairs. You typically had programming expertise in your particular field. But there should have been no a priori reason why this expertise should have to stretch to the installation process. Right?
Wilson gives an alternative. He details how you can use Windows Installer to install and uninstall your application. The process is still nontrivial, mind you. Which is why we have a book of this length. But it shows how, if you fit your application within WI's strictures, then the entire install is now much easier and safer.
Perhaps the single best advantage is that WI makes your install a transaction. Either it all works, or the install will fail and your system will be unaffected. Atomic. We have rollback ability.
Those of you familiar with SQL and transaction processing will recognise this. Wilson shows that WI is in fact based on SQL tables and relational processing. Some people at Microsoft made a nice design! By undergirding the installation with SQL tables. It lets WI have an inner coherent structure, into which third party applications can fit, in a disciplined way. Plus, it allows the panoply of SQL queries. At the right level, it is an elegant approach.
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