I wanted to disable a few web application on IIS server, running within the same application pool.
I've opened the pool properties, but I didn't find the option to disable. I've tried to find in Google, but didn't find the answer.
So I decided that changing identity to some not authorized user will be sufficient.
Fortunately, my collegue told me, that to disable pool you need to STOP it. And pool will be stopped until you as Admin explicitely start it.- it is not re-started autiomatically after reboot.
They just used slightly different terminology than I expected.
Related tip: To Rename a Virtual Directory in IIS 6.0 you need to edit Metabase.xml