The Patch Analyzer performs an analysis on your system if you want to upgrade to one of these releases that follow the initial Solaris 10 3/05 release.
Solaris 10 1/06 release
Solaris 10 6/06 release
If you are already running the Solaris OS and have installed individual patches, upgrading to a subsequent Solaris 10 release causes the following:
Any patches that were supplied as part of one of the releases noted above are reapplied to your system. You cannot back out these patches.
Any patches that were previously installed on your system and are not included in one of the releases noted above are removed.
You can use the Patch Analyzer to determine which patches, if any, will be removed. For detailed instructions about using the Patch Analyzer, refer to Appendix C, Using the Patch Analyzer When Upgrading (Tasks), in Solaris 10 6/06 Installation Guide: Solaris Live Upgrade and Upgrade Planning.