Those Properties are essentially "kill switches" for the CustomActions. 
I don't remember the scenarios off the top of my head but we added those 
and the SKIPCONFIGUREIIS based on some needs.  They are big red buttons 
that completely kill the CustomActions.  The Properties do not provide 
fine control.

The decisions to install/uninstall Resources (like WebSites or SQL 
Strings) is not controlled by those properties.

Richard wrote:
> In article <e66649032ad92b42901bf5835c76a27f9...@harwood.x2systems.com>,
>     "Neil Sleightholm" <n...@x2systems.com>  writes:
>
>   
>> I think you missed the point. I can see there are two different entry =
>> points, one for install the other for uninstall but what I can't see is =
>> the condition that says to run one on install and the other on =
>> uninstall. (Using the SQL one was probably a bad example as that has an =
>> override condition other don't.)
>>     
>
> Yeah, the SQL one might just be a bad example here.  The SQL actions
> are being gated by two different properties: SKIPUNINSTALLSQLDATA and
> SKIPINSTALLSQLDATA.  Although I haven't examined the source to say for
> sure, I'm willing to bet that there are type 51 CAs that set these
> properties appropriately when these actions need to run.  So the "do
> this on install", "do that on uninstall" logic is probably encoded in
> the conditions on the CAs that set the properties SKIPUNINSTALLSQLDATA
> and SKIPINSTALLSQLDATA.
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