I know that if you go through the pending updates, there's a flag (rebootrequired, or similar) that will tell you if a reboot is mandatory, not required, or may be required. It seems that in the metadata of a lot of updates, this is tagged as "maybe, not sure", so there's not a sure fire way to know if an update will cause a reboot.
Given the Microsoft.Update.Session API, is there a way to check through the update content to see if the code itself will change the registry setting
HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired to make windows knows it needs to reboot?
I'm assuming that, even though the metadata is "maybe", there's something in each update that forces this registry flag to to "Ping! I need to reboot!"
Either that, or is there a more reliable way to work out how check which updates require rebooting?