Each patch contains a cumulative set of fixes produced since the last Service Pack or Release, whichever is the later, and hence includes all fixes previously issued. It can only be applied on to that specific version (e.g. 2006 SP1). The patch has undergone Actian internal engineering tests, is fully supported by Actian but has not undergone the full QA test suite which is run for both full releases and Service Packs. Please also note that if you require patches for more than one platform the bugs fixed content may vary between platforms though Service Packs for any release will include the same fixes for all platforms.