My understanding of MSBuild is that it will only fire a Target once.
http://msdn.microsoft.com/en-us/library/ms171462.aspx

So I create a Target with a custom name and place a HeatDirectoy task in
that target.  Then I repeat that process creating a custom named Target to
include each HeatDirectory task for each folder that I need to harvest.  I
then list the Targets in a DependsOnTargets of the Target that I want to use
to trigger the harvesting.

<Target Name="Hrv_files"
DependsOnTargets="Hrv_App1;Hrv_App2;copyOnlyIfChanged" />

I also generate my output files to one folder and then only copy those files
to the project if they change to improve incremental building.



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