We're using burn to create a bootstrapper app that then loads a number of
applications within their own MSI's.

All of these applications have some third party shared components (ms
libraries, DevX controls etc) that are installed in the GAC and will not
change *very often* as they are outside of our development cycle, and so
have their own msi that is installed once, rather than per application.

These shared components are very large however, and therefore it would be
advantageous if we could leave them on the machine during a major upgrade.

If we mark the shared package as permanent, I understand that it is exactly
that - the installer registers an extra system client for the component in
the Windows Installer registry settings (which basically just means that at
least one product is always referencing this component), so we would not be
able to remove / update it if we needed to. 

What is the prescribed method of leaving components installed between
upgrades, but still giving us the ability to remove it when we want to?

Many thanks



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