Where Is the Registry Key for Office 2010 PIA (How to Determine If Office 2010 PIA Is Installed)

Question

Where is the Registry key for Office 2010 PIA?

For 2003/2007, I googled, and found: Office 2003 PIA:

RegKeyExists(HKLM, 'Software\Classes\Installer\Features\9040941900063D11C8EF10054038389C')

Office 2007 PIA:

RegKeyExists(HKLM, 'Software\Classes\Installer\Features\00002105501100000000000000F01FEC')

Thanks.