How to find out if an MSI I just installed requested a Windows reboot?

Question

I\'ve built a setup.exe in C# that runs several chained MSI\'s (with the /QUIET /NORESTART). At the end I\'d like to check if a reboot is needed in

Answer 1

To complement Vinko Vrsalovic's helfpul answer with a PowerShell command:

$rebootPending = $null -ne 
  (Get-ItemProperty 'HKLM:\System\CurrentControlSet\Control\Session Manager').PendingFileRenameOperations

Note that $rebootPending equalling $true indicates that a system reboot is pending for any reason, not just due to MSI-based installations.