WiX: WIX Logs show two INSTALL actions. What is the first one?

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I am analyzing the WiX logs (/Lv) during the installation process very carefully. What i realized, that during the install process two INSTALL actions will be started. The second one during the first is still processing. What is the first Install Action doing? Can i hook a CustomAction into the first Install step? Because every CustomAction i define with Before="a_state" will be executed in the second INSTALL run. Inside of the .wixobj i dont see any hint for the first INSTALL run and when i analyze the source code of WiX i dont find any hint nether.

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