Package manager update question

[Jacob Schmude]

Hi, all
I'm new to Window-Eyes app development, but not new to programming in 
general. I have a quick question about the package manager. How does the 
package manager check for updates? I've read the docs for GW Toolkit, 
and I understand how the CheckForUpdates object works. What I don't 
understand is how the package manager itself checks for updates. Does it 
fire off a CheckForUpdates sequence on each app, or does it work via 
some other method and where do I find docs for it if it doesn't use the 
GW Toolkit?

Thanks