How to find if a product is already installed if it's Product Id is 
known? Should be implemented some DLL/EXE-based CA or there are any 
"standard" MSI commands available?

The same about merge module. I want to find out if any copy of 
particular MSM (defined by its GUID) is installed, regardless of a 
product that encloses the MSM.

Best regards,
Peter G. Sakhno
C-MAP RUSSIA Ltd
http://www.c-map.ru/


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