I have 2 applications (App1 and App2). When I do a major upgrade of App1 I need 
to uninstall App2 (which I can accomplish by adding an upgrade element for 
App2). But I need to do something different in the uninstall sequence of App2 
if it was invoked by the major upgrade of App1 as opposed to being uninstalled 
on its own.

Is there some way to reference a property set in App1 and used in a condition 
in App2?
Or is there an existing property that lets me know how it was invoked?
Or do I need to set a registry value and make sure it is scheduled before 
RemoveExistingProducts in App1 and use in App2?

Thanks - Tom

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