How to find the "installer engine" of a Microsoft KB?

Hello, To make a long story short, I am making an app that will scan a PC upon logging on and install missing windows updates.  Now the problem I am having is that Microsoft got 2 types of installer for their updates. (Update.exe is the most common, and MSIEXEC)

Now if you right click and go to properties of one of the KB files, in the version TAB you have extra informations.  One of them is "Installer engine"  I want to know that value if that is possible.
Both installer engine uses different switches to make a silent and no restart installation.

I dont want to reboot in the middle of a bunch of installations.  I know the /Q will work for almost all of them though i dont think that would suppress the reboot.  Or maybe there is a better way of doing this?
I just want to find the engine so I can run the patch with the proper switches.  If you are to provide any code, please use vb6 or vbscript, our environment do not use .NET on client machines yet.

If you know a better way to install multiple patches silently and without reboot then please say it :)

As a side question.... anybody knows a better way to scan for installed hotfix beside WMI + folder scanning?

Thanks alot for the help!