How exactly does the Guid="*" work?  I've seen and read this in the WiX SDK
before.

The <Component>, <Package>, <Patch>,  <Product> elements support
auto-generation of GUIDs every time you build your project by specifying a *
in place of the GUID.

The way it reads to me it sounds like the GUID would get randomly changed
every time I build my WiX project.  In fact, I have used this on Product
elements in some projects and that does change the GUID on every build.

If this works differently for Component elemnts and the GUID is determined
in a consistent fashion, what does it use to determine the GUID so that I
can be assured my component GUIDs won't change without my knowledge?

I've worked with Windows Installer long enough to know that following
component rules is key, else you get screwed on upgrades and patches down
the road.  So I'm quite cautious when it comes to these things.

BTW, the product I'm working on has not shipped yet.
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