I swear I knew this, but for the life of me I can't figure it out:

How do I use the Feature Id in a custom action condition ? I used something 
like this during Install and Uninstall but this doesn't seem to work. Is there 
a reference on how the ampersand (&) evaluates when applied to Feature ID ?

<InstallExecuteSequence>
<Custom Action="InstallApp" After="InstallFiles"><![CDATA[(&MyCoolApp = 3) AND 
(NOT Installed)]]></Custom>
<Custom Action="UnInstallApp" Before="RemoveFiles"><![CDATA[(&MyCoolApp <> 3) 
AND (Installed)]]></Custom>
</InstallExecuteSequence>

-Arvind

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